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Curtin, M. Parent–Child Interactions in Deafness Children. Encyclopedia. Available online: https://encyclopedia.pub/entry/13765 (accessed on 21 December 2024).
Curtin M. Parent–Child Interactions in Deafness Children. Encyclopedia. Available at: https://encyclopedia.pub/entry/13765. Accessed December 21, 2024.
Curtin, Martina. "Parent–Child Interactions in Deafness Children" Encyclopedia, https://encyclopedia.pub/entry/13765 (accessed December 21, 2024).
Curtin, M. (2021, August 31). Parent–Child Interactions in Deafness Children. In Encyclopedia. https://encyclopedia.pub/entry/13765
Curtin, Martina. "Parent–Child Interactions in Deafness Children." Encyclopedia. Web. 31 August, 2021.
Parent–Child Interactions in Deafness Children
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This entry is adapted from the peer-reviewed paper 10.3390/jcm10153345

Despite early identification and advancements in cochlear implant and hearing aid technology, delays in language skills in deaf children continue to exist. Good-quality parent–child interaction (PCI) is a key predictor for the successful development of deaf children’s signed and/or spoken language. As good-quality PCI is widely acknowledged to be significant for child language development in deaf children, then we must have the necessary tools to assess it. This review answers three questions: Which parent behaviours are assessed in PCI? How are they assessed? And which parent interaction behaviours are positively correlated with deaf children's language skills?

deaf parent–child interaction assessment early interaction speech and language therapy

1. Introduction

Much research describes the importance of good-quality parent–child interaction for children’s language development [1]. Parents are seen as the main provider of the social and linguistic stimulation required for successful child language development [2].
Children develop the foundations of language through the ‘serve and return’ of communicative interactions with their caregiver. This happens first through vocal and visual means (exclamations, babbling eye contact, facial expressions, gestures and pointing) and then through language use [3]. Parents scaffold this development through prompts and contingent reactions to their child’s behaviours [4]. These behaviours in turn encourage and reinforce a child’s communicative intentions [5]. For example, relationships have been found between a parent’s responses to child gesture and vocalisation, and child vocabulary development [6].

1.1. Parent–Child Interaction (PCI) and Deafness

Despite earlier identification and advancements in hearing aid and cochlear implant technology, delays in receptive and expressive language skills in deaf children continue to exist [7][8]. Many studies have found the quantity and quality of parental interaction to be one of the main predictors of deaf children’s language outcomes [9][10][11][12][13]. Parents who have not yet developed skills in effectively communicating with their deaf child may provide lower-quality language input [14], which in turn affects the child’s language development.

To illustrate, studies have reported that hearing parents of deaf children can often be more directive in their interactions compared to deaf parents of deaf children and hearing parents of hearing children [7][15]. This manifests as increased interruptions to the child’s attention by parents initiating new, unrelated activities [16]. Hearing parents also elicit language from their deaf child through requests rather than conversations, meaning deaf children have less experience of two-way interaction and receive less feedback on their communicative attempts [17]. An important foundation for language development is joint attention, i.e., two people with a mutual focus. Hearing parents struggle to establish and maintain this behaviour with their young deaf infants [18][19]. Higher rates of directive behaviours from hearing parents of deaf children [15][20], are less conducive for maintaining attention. The mismatch of hearing status means that hearing parents need to adapt their communication skills to attain successful joint engagement in by gaining or waiting for the deaf child’s attention before starting to communicate and sequentially shifting attention between the environment/objects and each other. In comparison, deaf parents are using these social engagement strategies at an early age with their deaf infants [21][22] and we see an earlier tuning in of the deaf child’s gaze [23].

1.2. Improving Parent’s Skills in Interaction

Despite the association between parental interaction and child language development, enhancing hearing parents’ communication with deaf children is a complex issue. Parents of deaf children receive multiple home visits and attend appointments for medical and audiological purposes where they learn about deafness, communication, and future education [24]. To reduce the communication difficulties that can cause increased family stress [25], hearing parents are required to adapt their communication style and often receive family-centred interventions that incorporate new strategies to enhance their interaction skills. The level of parental involvement in these interventions varies and can be associated with acceptance of the child’s deafness, parental self-efficacy, and the amount of support a family receives [26].

2. Parent–Child Interactions Assessment in Deafness Children

2.1. Parent Behaviours Are Being Assessed in PCI Studies

2.1.1. Attention-Getting Behaviours

Attention-getting behaviours can be defined as explicit bids, made by the parent, with the intent of gaining or directing their deaf child’s attention. The bid for attention can use one or more modalities. Fourteen (14) of the 61 studies (papers 1 to 14 in Table 1) observed this aspect of parent behaviour. Data from these papers have been synthesised into four modalities: visual, auditory, tactile, and multi-modal.
Table 1. Papers included in the review (n = 61) and the associated research questions.
Paper
No		 First Author Year Reported Country of Study Study Design Degree of Hearing Loss No of Dyads PCI Behaviours Assessed PCI Measure (Method) Child Lang Assessed? Risk of Bias
1 Beatrijs. W., et al. [21] 2019 Belgium Two between-groups,
observational studies		 No Report 13 Attention-Getting
Strategies		 Coding N Moderate
2 DesJardin, J. L. [27] 2006 USA Within-group,
observational study		 Mod–Prof 32 Attention-Getting Strategies and Parental Communication Coding Y Moderate
3 Loots, G. et al. [28] 2003 Belgium Between-groups,
observational study		 Mod–Prof 33 Attention-Getting
Strategies		 Coding N Low
4 Waxman, R. et al. [29] 1997 USA Between-groups,
observational study		 Mild–Prof 77 Attention-Getting
Strategies		 Coding N Moderate
5 Chasin, J. et al. [30] 2008 UK Between-groups,
observational study		 Profound 9 Attention-Getting Strategies and Child Eye Gaze Coding N Moderate
6 Harris, M. et al. [31] 1989 UK Within-group,
longitudinal
observational case series		 Profound 4 Attention-Getting
Strategies and Child Eye Gaze		 Coding Y Serious
7 Harris, M. et al. [32] 1997 Australia and
UK		 Between-groups,
observational study		 Profound 11 Attention-Getting
Strategies and Child Eye Gaze		 Coding N Critical
8 Harris, M. et al. [32] 2005 UK Between-groups,
observational study		 Profound 26 Attention-Getting
Strategies and Child Eye Gaze		 Coding N Moderate
9 Lederberg, A. R. et al. [33] 1998 USA Between-groups,
observational study		 Sev–Prof 40 Attention-Getting Strategies and Child Eye Gaze Coding Y Moderate
10 Prendergast, S. G. et al. [34] 1996 USA Between-groups,
observational study		 Sev–Prof 16 Attention-Getting Strategies and Child Eye Gaze Coding N Moderate
11 Gabouer, A. et al. [35] 2018 USA Between-groups,
observational study		 Sev–Prof 18 Attention-Getting Strategies and Joint Engagement Coding N Serious
12 Loots, G. et al. [22] 2005 Belgium Between-groups,
observational study		 Mod–Prof 31 Attention-Getting Strategies and Joint Engagement Coding N Low
13 Nowakowski, M. et al. [36] 2009 Canada Between-groups,
observational study		 Sev–Prof 56 Attention-Getting Strategies and Joint Engagement Coding Y Moderate
14 Tasker, S. et al. [37] 2010 Canada Between-groups,
observational study		 Sev–Prof 53 Attention-Getting Strategies and Joint Engagement Coding Y Low
15 Barker, D. H et al. [7] 2009 USA Between-groups,
observational study		 Sev–Prof 185 Joint Engagement Coding Y Low
16 Cejas, I. et al. [8] 2014 USA Between-groups,
observational study		 Sev–Prof 276 Joint Engagement Coding Y Moderate
17 Roos, C. et al. [38] 2016 Sweden Within-group,
observational study		 Sev–Prof 12 Joint Engagement Coding N Moderate
18 Spencer, P. E. [39] 2000 USA Between-groups,
observational study		 Mod–Prof 80 Joint Engagement Coding N Serious
19 Dirks, E. et al. [18] 2019 The Netherlands Between-groups,
observational study		 Mod 51 Joint Engagement and Parental Sensitivity Existing Scale + Coding Y Low
20 Gale, E. et al. [40] 2009 USA Between-groups,
observational study		 Sev–Prof 15 Joint Engagement and Parental Sensitivity Coding Y Moderate
21 Janjua, F. et al. [41] 2002 UK Within-group,
observational study		 Sev–Prof 13 Joint Engagement and Parental Sensitivity Coding Y Serious
22 Lederberg, A. R. et al. [42] 1990 USA Between-groups,
observational study		 Mild–Prof 82 Joint Engagement and Parental Sensitivity Novel Scale + Coding Y Moderate
23 Meadow-Orlans, K. P. et al. [43] 1993 USA Between-groups,
observational study		 Mod–Prof 80 Joint Engagement and Parental Sensitivity Novel Scale + Coding N Moderate
24 Meadow-Orlans, K. P. et al. [16] 1996 USA Between-groups,
observational study		 Mod–Prof 80 Joint Engagement and Parental Sensitivity Novel Scale + Coding N Moderate
25 Abu Bakar, Z. et al. [44] 2010 Not reported Between-groups,
observational study		 Sev–Prof 18 Parental Sensitivity Novel Scale N Serious
26 Meadow-Orlans, K. P. et al. [45] 1995 USA Within-group,
observational study		 Mild–Prof 43 Parental Sensitivity Novel Scales N Moderate
27 Lam-Cassettari, C. et al. [46] 2015 UK Between-groups,
intervention study		 Mod–Prof 14 Parental Sensitivity Existing Scale N Moderate
28 Meadow-Orlans, K. P. [47] 1997 USA Between-groups,
observational study		 Mod–Prof 40 Parental Sensitivity Novel Scales N Moderate
29 Pressman, L. J. et al. [48] 1998 USA Between-groups,
observational study		 Mild–Prof 42 Parental Sensitivity Existing Scale Y Moderate
30 Pressman, L. J. et al. [49] 1999 USA Between-groups,
observational study		 Mild–Prof 24 Parental Sensitivity Existing Scale Y Low
31 Spencer, P.E. [50] 1996 USA Between-groups,
observational study		 Mod–Prof 43 Parental Sensitivity Novel Scale Y Low
32 Vohr, B. et al. [51] 2010 USA Between-groups,
observational study		 Mild–Prof 58 Parental Sensitivity Existing Scale Y Low
33 Waxman, R. et al. [52] 1996 USA Between-groups,
observational study		 Mod–Prof 30 Parental Sensitivity Coding N Moderate
34 Ambrose, S. E. [53] 2016 USA Between-groups,
observational study		 Mild–Prof 48 Parental Sensitivity Coding Y Low
35 Caissie, R. et al. [54] 1993 Not reported. Between-groups,
observational study		 Sev–Prof 11 Parental Sensitivity Coding Y Serious
36 Eddy, J. R. [55] 1997 Australia Between-groups,
observational study		 Sev–Prof 18 Parental Sensitivity Coding Y Serious
37 Glanemann, R. et al. [56] 2013 Germany Between-groups,
intervention study		 Mod–Prof 29 Parental Sensitivity Coding Y Moderate
38 Wedell-Monnig, J.; et al. [57] 1980 USA Between-groups,
observational study		 Sev–Prof 12 Parental Sensitivity Coding N Serious
39 MacTurk, R. H. et al. [58] 1993 USA Between-groups,
observational study		 Mod–Prof 40 Parental Sensitivity and Child Eye Gaze Novel Scales N Serious
40 Choo, D. et al. [59] 2016 Australia Within-group,
observational study		 Sev–Prof 12 Parental Sensitivity and Parental Communication (Comm.) Novel Scale N Moderate
41 James, D. et al. [60] 2013 UK Within-group,
intervention study		 Profound 3 Parental Sensitivity and Parental Comm. Existing Scale + Coding Y Serious
42 Nicastri, M. et al. [11] 2020 Italy Between-groups,
intervention study		 Profound Not reported: 22 parents of 14 children Parental Sensitivity and Parental Comm. Existing Scale Y Moderate
43 Preisler, G. M. [61] 1995 Sweden Within-group,
observational study		 No Report 14 Parental Sensitivity and Parental Comm. Coding N Serious
44 Quittner, A. L. et al. [12] 2013 USA Between-groups,
intervention study		 Sev–Prof 285 Parental Sensitivity and Parental Comm. Scales (×2 existing, ×1 novel) Y Low
45 Quittner, A. L. et al. [62] 2016 USA Between-groups,
observational study		 Profound 285 Parental Sensitivity and Parental Comm. Scales (×1 existing/×1 novel) Y Low
46 Ahmad, A. et al. [63] 2016 Australia Between-groups,
observational study		 Mild–Prof 16 Parental Communication Coding N Moderate
47 Brown, P. M. et al. [64] 2004 Australia Between-groups,
observational study		 Profound 20 Play and Parental Communication Coding Y Moderate
48 Chen, D. [65] 1996 USA Between-groups,
observational study		 Mod–Prof 12 Parental Communication Coding Y Serious
49 DeVilliers, J. et al. [66] 1993 USA Within-group,
observational study		 Profound 2 Parental Communication Coding N Critical
50 Morelock, M. et al. [67] 2003 USA/Australia Between-groups,
observational study		 Profound 9 Parental Communication Coding N Serious
51 Roberts, M. [68] 2019 USA Randomised controlled trial Mod–Prof 19 Parental Communication Coding Y Moderate
52 Koester, L. S. et al. [69] 2010 USA Between-groups,
observational study		 Mod–Prof 61 Parental Communication Coding N Serious
53 Paradis, G. et al. [70] 2015 USA Between-groups,
observational study		 No Report 60 Touch and Parental Sensitivity Existing Scale + Coding N Moderate
54 Pipp-Siegel, S. et al. [71] 1998 USA Between-groups,
observational study		 Mild–Prof 48 Touch and Parental Sensitivity Existing Scale + Coding N Moderate
55 Abu-Zhaya, R. et al. [72] 2019 USA. Between-groups,
observational study		 Mild–Prof 24 Touch Coding N Moderate
56 Gabouer, A. et al. [73] 2020 USA Between-groups,
intervention study		 Sev–Prof 18 Touch Coding N Serious
57 Spencer, P.E. [74] 1993a USA Between-groups,
observational study		 Mod–Prof 36 Other: Maternal Comm. Modality Coding Y Low
58 Spencer, P.E. [75] 1993b USA Between-groups,
observational study		 Mod–Prof 7 Other: Maternal Comm. Modality Coding Y Moderate
59 Lederberg, A. R. et al. [76] 2000 USA Between-groups,
observational study		 Sev–Prof 40 Other: Maternal Comm. Modality Coding Y Moderate
60 Depowski, N. et al. [77] 2015 USA Between-groups,
observational study		 Sev–Prof 8 Other: Type and Use of Gesture Coding N Serious
61 Lieberman, A. et al. [78] 2014 USA Between-groups,
observational study		 Mod–Prof 8 Other: Maternal and Child Eye Gaze Coding Y Moderate

Visual Strategies

Using any of the following within the child’s visual field with the intention to gain or direct the child’s attention: waving, gesturing, reaching, pointing, making eye contact, switching gaze between an object and the child, holding or moving an object or toy directly into the child’s visual field, offering an object, manipulating an object, demonstrating play with toys, making faces, displacing the location of a sign into the child’s vision or signing space, and changing affect.

Auditory Strategies

Using any of the following sounds to gain a child’s attention: using voice to call the child’s name, using a word such as ‘look!’ or non-words (e.g., ‘whee’ or ‘pssst!’), humming or singing; use of the body to make sounds (outside of the child’s visual field) such as clapping or clicking; and/or the use of toys or objects to make sounds.

Tactile Strategies

Using any of the following to gain or direct a child’s attention: making gestures or signs on the body of the child; tapping, touching, hugging, or holding the child; grabbing on to the child’s clothing; moving the child’s limbs; and touching the child with a toy (out of their visual field). This category also includes tapping the ground to create vibrations, and physically adjusting the child’s position to direct their attention.

Multi-Modal Cues

Combinations of the above—multi-modal cues—were also coded. For auditory-visual combinations, a parent might say ‘uh oh!’ and gesture as a toy rolls under the table. For visual-tactile, a parent may turn a child sat on their lap and then point to a new toy out of their current visual field. Other combinations may be auditory-visual-tactile, e.g., holding a child while talking to them and pointing to a toy.
Coding in papers that included deaf parents of deaf children also featured ‘waiting’ as an attention-getting strategy [1][3][10][15], e.g., it was noted when parents did not initiate the interaction or any expression but actively waited until their child was looking at them before communicating. This could be seen as an attention-getting strategy, as a paused action may warrant the child to look towards the parent. These papers also put greater focus on parents’ visual-tactile attention-getting strategies (ibid).
Related to interaction, six studies (papers 5–10 in Table 1) reported on the success of parental attention-getting behaviours in relation to child gaze and noted gaze could be either elicited, responsive, spontaneous, and failed.
Papers 11 to 14 in Table 1 combined attention-getting behaviours with joint engagement between parent and child. This phenomenon was the focus for many more papers included in this review and is defined and described in the next section.

2.1.2. Joint Engagement

Joint engagement is a state of mutual focus and shared involvement between a parent and child, where both participate in reciprocal, contingent, socially directed behaviours. Authors use the following terms interchangeably: joint engagement, joint attention, and intersubjectivity, with frequent references to the coding systems of Bakeman and Adamson [79], Prezbindowski and colleagues [80], and Tasker and Schmidt [81]. Twelve of the studies observed this phenomenon (papers 11 to 24 in Table 1).

When Engagement Is Established and When It Is Terminated

Marking joint engagement as ‘established’ varied from three seconds of mutual focus to a five-second rule of engagement (where the child had to respond to a parent’s act within five seconds). It was also categorised as three or four sequential, on-topic, connected turns where both the parent and child’s attention and/or language are focussed on the same event or object. Physical acts were also included (such as tickling or laughing). Similarly, how to class a state of joint engagement as finished also varied across papers. Joint engagement was ‘terminated’ when one social partner stopped responding and their attention was lost after a set time period which varied between papers from 3 to 15 s.

Levels of Joint Engagement

Some authors differentiated between ‘supported/passive’ joint engagement, with the parent joining the child in an activity and helping to support the joint engagement, without the child acknowledging the parent, and ‘coordinated’, wherein both parent and child exclusively engaged with each other and the activity. Interactions may be physical and/or visual (body movements, facial expressions, tickles) or may be ‘symbol-infused’, which refers to the use of language (signed, spoken or referential gesture) within a period of joint engagement.
The authors of the current review use ‘joint engagement’ as the term suggests parent and child are active participants, doing more than simply attending to the same thing.

2.1.3. Parental Sensitivity

Parental sensitivity refers to a set of skills that enables a parent to be emotionally connected, in tune and responsive to their child’s needs, goals, and communicative attempts. A parent with a high level of sensitivity will be positive and accepting of their child and will strive for interactive congruence. Twenty-five (25) studies within the review assessed this aspect of parent behaviour (papers 19 to 45 in Table 1) and therefore it is the most frequently assessed aspect of PCI. Across papers parental sensitivity was described as a group of sub-skills. Parents were often assessed on each of these sub-skills using Likert-scales. These behaviours consisted:

Positive Regard

A parent showing enthusiasm, warmth, pleasure, love, and respect for their child, regularly using positive body language, praise and comforting and playful physical touch. Opposite: Covert or overt hostility, negative affect, physical harshness.

Availability

A parent who is genuinely interested and actively involved in participating in accessible interactions with their child. Opposite: Passive, bored, and disengaged.

Contingent and Responsive

A parent that follows their child’s lead and pace and responds with contingent, on-topic behaviours or language. Opposite: Directive, intrusive, dominant, and regularly initiating new topics.

Emotionally Sensitive

A parent who is emotionally attuned and adaptive. Able to recognise and respond to distress and disinterest, and repair or resolve misunderstandings or conflict. Opposite: Lacking or unhelpful emotional responses, unwillingness to soothe or resolve incidents causing discomfort.

Structure and Stimulation

A parent who is able to support a child’s interest by guiding and developing the interaction with appropriate play and language. The parent will be flexible and accept a change in play or routine put forward by the child. Opposite: Overpowering, structuring the play, inappropriate pace or activity, highly authoritative, inflexible, or formally teaching the child.

Consistency

A parent who can absorb a range of child emotions and behaviours, whilst remaining mostly constant in their behaviours, predominantly striving for a positive interaction. Opposite: Unpredictable behaviour that changes regularly in the interactions from positive to negative.
Most of the papers also included a rating of the child’s levels of responsiveness (also termed compliance or eagerness to respond) and involvement (initiations made, willingness to share). Some codes and scales rated the dyads for overall synchronicity, reciprocity, enjoyment, and communicative competence (understanding of one another). Papers 39 to 44 assessed parental sensitivity along with parental communication behaviours.

2.1.4. Parental Communication Behaviours

Parental communication behaviours are language-focused strategies used by parents during moments of interaction with their deaf child. Though most are explicitly linked to exposing the child to signed or spoken language, some behaviours are centred around increasing the child’s access to spoken or signed language. Papers that only recorded and analysed parent’s verbal interactions were excluded (n = 43) and are listed in Appendix C. Thirteen papers assessed parents on a range of communicative behaviours (papers 40–52 in Table 1) and these are summarised below:
Increased access to language: Some papers assessed parents on their ability to communicate within the child’s line of sight or whilst being face to face; others observed parents’ use of timing, i.e., waiting for the child to look before communicating. Others observed parents’ use of child-directed speech or child-directed sign, i.e., where parents modify their speech or sign to be more child orientated. For example, a parent may adapt the palm orientation of a sign so the child can see more of the hand; they may increase the size and range of movement of signs, they may exaggerate the non-manual features of accompanying signs (facial expressions), use exaggerated vocal pitch or acoustic/sign highlighting, where the parent adapts their amplification of words or signs closer to the child.
Language input: This category refers to signed or spoken languages. Similar to parental sensitivity, parents were assessed on their contingent talk and number of connected turns, as well as their off-topic initiations (i.e., directives, requests and questions). Parents’ use of language stimulation was coded and assessed on how they: labelled items or feelings; commented; described; made accompanying sounds; interpreted their child’s behaviour with language; repeated their child’s utterance; expanded their child’s language by adding 1 or 2 new words, or rephrased it with correct grammar. Parents’ mean length of utterance (MLU) was assessed in one paper. Parents’ use of praise, affirmation and encouragement was assessed through language use, intonation, their gesture, and facial expressions. Assessment of less frequent behaviours included the parent modelling play, and the parent opposing the child, either by rejecting their communication, correcting their communication, or prohibiting their child’s behaviour.

2.1.5. Use of Touch

The frequency and function of parents’ use of touch when interacting with their child was also assessed in a small set of studies (Papers 53–56 in Table 1). The authors of these papers were interested in the type, location, and duration of parent-initiated touch. One paper looked at the temporal alignment between touch and parents’ utterances [72]. Two papers also measured parental sensitivity [70][71] with Paradis and Koester [70] creating a coding system to analyse the function of parental touch, e.g., affectionate, attention-getting and instructive.

2.1.6. Other

Five papers included in the review sit within this category (papers 57–61 in Table 1). Three papers [74][75][76] focused on the communication mode of parents (i.e., how often they signed, used gesture or spoke). One paper looked in detail into the type and function of gesture used [77] and another transcribed American Sign Language and documented eye gaze between mother and child [78].

2.2. Parent Behaviours Assessed

Most papers (66%, n = 40) used a coding system to assess PCI, often watching and coding films frame by frame, using software such as INTERACT (Mangold) and ELAN (Max Planck Institute). This method allowed an in-depth analysis of the behaviours focused on in RQ1. Thirteen (13) papers (22%) used Likert scales instead of coding and some scales were well-known and validated, while others were developed for the specific research study with little mention of pilot testing prior to their use. The Emotional Availability Scales [82] were used in 7 of the 11 papers that used validated scales. Nine papers (12%) used a combination of coding and scales. See Table 2.

Table 2. Methods of assessing PCI between included papers.
Method of Assessing PCI n Papers (%)
Coding 40 (66%)
An existing, validated scale 7 (12%)
A novel scale 4 (7%)
A mix of validated and novel scales 2 (3%)
Coding and a validated scale 4 (6%)
Coding and a novel scale 4 (6%)

2.3: Which Parent Behaviours Are Associated with Higher Child Language Scores?

2.3.1. Joint Engagement

Higher child language scores were related to more time in higher level engagement states with a parent (i.e., coordinated joint engagement and symbol-infused joint engagement) [8]. Deaf children spent significantly less time in these states when compared to their hearing peers and therefore used less language [7][40].
Dirks and Rieffe [18] add further evidence to this finding: deaf children and their hearing parents are less successful in establishing joint engagement and have briefer episodes when they do. These authors found positive correlations between total duration of joint engagement and receptive and expressive language skills. Interestingly, Gale and Schick [40] and Dirks and Rieffe [18] found correlations between non-intrusiveness and joint engagement in mothers who followed their toddler’s interests, rather than directing, and this was also linked to more instances of joint engagement.

2.3.2. Parental Sensitivity

Maternal sensitivity was positively correlated with expressive language and predicted language growth over time [12][62]. In their study of 285 deaf children with cochlear implants, Quittner and team found parents with above-average skills in maternal sensitivity and language stimulation had children with 1.52 years less of a language delay [12]. Dirks and Rieffe [18] also found positive relationships between parental sensitivity and receptive and expressive child language and total duration of joint engagement. Children with better language experienced longer interactions with their parents and this was linked to parents with higher levels of emotional sensitivity (ibid).
In their 1999 study, Pressman and colleagues found that maternal sensitivity was not correlated with children’s initial expressive language scores, but was positively correlated in their follow up assessments 12 months later [49]. In their regression analyses, maternal sensitivity positively predicted expressive language scores and accounted for 10% of the variance. In their 1998 study, they uncovered that maternal sensitivity had a larger positive effect on language in the sample of deaf children compared to their hearing sample [48].

2.3.3. Parental Communication Behaviours

In the study from Nicastri et al. [11], parents received nine whole-group sessions and three individual sessions of training over 10.5 months. The intervention was based on the ‘It Takes Two to Talk’ Hanen program [83] and involved video modelling, where parents had opportunities to put their training into practice at home. Strategies within the program included waiting and observing the child, following the child’s lead, interpreting the child’s behaviour, parallel talk, and expanding and recasting the child’s language. The authors reported significant gains in parent communication behaviours and parental sensitivity post-intervention and noted that parents in the treatment group had children with significantly better language skills, when formally assessed three years post treatment.

A pilot RCT [68] involved parents receiving weekly, hour-long sessions for six months, where they were explicitly taught to use strategies to promote early communication. The authors referred to methods such as enhanced milieu teaching [84], prelinguistic milieu teaching [85], and The Hanen Program It Takes Two to Talk [83]. Examples of strategies include sitting face to face, using gestures, imitating/mirroring the child’s actions, and turn taking. The study reported that parents in the treatment group increased their use of communication support strategies by 17% compared to 2% in the control group., There was a large effect size of 1.09 (p = 0.03) for the difference in gains in deaf children’s prelinguistic speech skills between the treatment and control groups.

3. Summary

The four main areas of PCI uncovered have some parallels with the review on children with language difficulties by Roberts and Kaiser [86], where the three most measured parent strategies were: parent responsiveness, use of language models and rate of communication. Similarly, a review by Holzinger and colleagues [87] on children with cochlear implants uncovered family involvement and parental linguistic input as key themes in their results. Additionally, within PCI research in the hearing population, the same set of behaviours are commonly measured [88].

The most prominent way of assessing PCI was with coding systems to analyse interactions. However, coding methods differed depending on the authors’ research focus. Some of the coding systems referred to well-known frameworks such as those from Waxman and Spencer [29], where attention-getting behaviours are well described and the coding scheme from Adamson, Bakeman, and Deckner [79], which includes 11 states of joint engagement. Other coding systems were created for the purposes of the particular study and papers did not report on the piloting of coding prior to their use.
Behavioural observation is the ideal method for assessing the quality of interactions and reduces the risk of bias that may arise from the use of self-reporting tools [89]. Lotzin et al. [88] also limited their review of PCI assessments to objective instruments, with all 24 of their included measures being validated rating scales.
Longer periods of joint engagement, increased parental sensitivity and a range of facilitative language techniques were all correlated with higher levels of language in deaf children. Parents with higher rates of maternal sensitivity and language stimulation have a greater effect on their child’s expressive language scores over time [11][49].
An important correlation highlighted by Vohr et al. [51] was that parents with more support and higher SES had decreased intrusiveness, directiveness and negative regard. The better supported a parent is, the more sensitive, responsive, and positive they will be in their interactions. Hintermair [90] mirrored this finding in his study with parents of deaf children showing that child development profits from parents accessing ‘personal and social resources’ that influence their coping process and significantly lower stress. Furthermore, Zaidman-Zait et al. [91] found that higher levels of child acceptance were associated with lower levels of parenting stress in parents of deaf children.

4. Recommendations

We make the following recommendations for future research on PCI and deafness:
1.
Provide full details with regard to participant information, for both the child and their parents including level of deafness, amplification use, child communication profile and parent-to-child communication profile (see ‘Language Access Profiles’ from Hall [92]).
2.
Report all methodological details of parent–child interaction assessment including who filmed the PCI, location of the assessment, instructions given to parents, length of the recording and length of film analysed.
3.
Use validated scales to assess PCI. We refer readers to Lotzin et al. [88] for their comprehensive list of psychometrically tested measures, where Biringen’s Emotional Availability Scales [82] are listed. This was the most commonly used validated scale in this review. In addition, reliability statistics should be reported.
4.
Use frame-by-frame coding as a detailed method of analysis. Coding schemes should be explained in detail and their development and pilot testing described. Reliability statistics should be reported.
5.
Recruit more representative samples of families with diverse socio-economic status and ethnicity.
6.
Recruit and/or include deaf children with additional needs for similar reasons. The proportion of deaf children with additional needs is 22% [93].
7.
Carry out more RCTs to explore causation between parental interaction and deaf children’s language growth.

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