Human Development & Quantitative Methodology

Permanent URI for this communityhttp://hdl.handle.net/1903/2248

The departments within the College of Education were reorganized and renamed as of July 1, 2011. This department incorporates the former departments of Measurement, Statistics & Evaluation; Human Development; and the Institute for Child Study.

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    Social and Emotional Functioning of Children with Cochlear Implants
    (2005-04-18) Schorr, Efrat; Fox, Nathan A; Human Development; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Studies of infants and children have demonstrated the importance of sensory processing in facilitating social and emotional development. Children who are deaf are deprived of the information typically provided by the auditory modality that is necessary to the development of basic social and emotional skills, which serve as the foundation upon which complex social and emotional constructs are built. Children with cochlear implants experience extended periods of total auditory deprivation during early childhood, followed by the introduction of auditory stimulation. Thirty-nine children with cochlear implants, aged five through fourteen, as well as an age and sex matched group of normal hearing peers, participated in assessment of the integrated perception of multimodal stimuli, processing of facial and vocal expressions of emotion, and emotion understanding skills. These dimensions of basic social and emotional functioning are vulnerable to the effects of atypical early experience. The age at which children received their cochlear implant and the length of time that they have used the cochlear implant were hypothesized to predict performance on the assessments. Results showed that the age at implant predicted performance on the McGurk fusion task, which requires the integration of multimodal sensory stimuli. Specifically, children who received their cochlear implant prior to age 30 months accurately identified the incongruent auditory-visual stimuli, whereas children who received their cochlear implant after 30 months of age did not. Age at implant and duration of implant use did not predict performance on the other experimental tasks. Comparison of groups revealed that performance of children with cochlear implants did not differ from children with normal hearing in a facial emotion identification task and in 2 components of emotion understanding: receptive identification of facial expressions and affective-perspective taking. Children with cochlear implants demonstrated poorer performance than children with normal hearing in tasks requiring free labeling of facial expressions of emotion, and vocal emotion identification. This research suggests sensitive periods in multimodal sensory integration. The present study provides understanding of the social and emotional influences of early experience with the auditory system on children with cochlear implants.
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    The emotional modulation of the startle reflex in 9-month-old infants
    (2004-04-30) Marshall, Dalit Himmelfarb; Fox, Nathan A; Human Development
    The purpose of this research project was to investigate whether the startle reflex of 9-month-old infants can be modulated by emotional stimuli, as well as to examine the specific characteristics of infants' startle reactions in an emotion-modulated paradigm. Two studies were conducted to address these questions. In Study 1, 32 9-month-old infants viewed photographs of happy, neutral, and angry facial expressions. Infants' startle responses to acoustic probes during the presentation of the facial stimuli were recorded and compared across the three affective conditions. Autonomic and looking time data were also gathered in order to evaluate the contribution of other factors, such as attention, to the modulation of the startle reflex. The results of this study indicated a pattern of startle modulation opposite to that documented in adults. Infants demonstrated a potentiated startle reflex during the viewing of happy faces and an inhibited response during the viewing of angry faces. Differences in heart period and looking time between the affective conditions suggested that these findings were driven, at least in part, by greater allocation of attentional resources to angry expressions. To further examine the role of emotion in infants' startle modulation, an independent group of 25 9-month-old infants was tested in a second, modified emotion-modulated startle paradigm that involved the presentation of acoustic startle probes while infants were engaged in a pleasant game of peek-a-boo, an affectively neutral presentation of a spinning bingo wheel, and a mildly frustrating arm restraint episode. Autonomic and behavioral data were also gathered. As expected, the results revealed startle potentiation during the unpleasant condition and startle inhibition during the pleasant condition, indicating the existence of the emotion-modulated startle reflex in 9-month-old infants. Results of both studies are discussed in terms of the role of emotion and attention in startle modulation, the maturation of the appetitive and defensive brain systems in infants, and the importance of establishing a rigorous and age-appropriate startle paradigm to foster the study of infants' emotionality. Suggestions for further studies utilizing such a paradigm to investigate different aspects of emotional reactivity in infancy are also proposed.