Biomedical subjects

Grace Iarocci

Publications and source records attributed to Grace Iarocci.

7 recordsLinked to original sources

PubMed2006

Sensory integration and the perceptual experience of persons with autism.

Research studies on sensory issues in autism, including those based on questionnaires, autobiographical accounts, retrospective video observations and early experimental approaches are reviewed in terms of their strengths and limitations. We present a cognitive neuroscience theoretical perspective on multisensory integration and propose that this may be a useful way of conceptualizing and studying sensory integration and the perceptual experience of persons with autism. Our goal is to operationalize the concept of sensory integration, a notion that is frequently alluded to in the field of autism yet rarely defined in empirical terms. We conclude with a discussion of how this re-conceptualization and study of sensory integration may generate testable hypotheses and lead to refinements in current perceptual theories of autism.

Autistic Disorder↗

PubMed2006

Global-local visual processing in high functioning children with autism: structural vs. implicit task biases.

Global-local processing was examined in high-functioning children with autism and in groups of typically developing children. In experiment 1, the effects of structural bias were tested by comparing visual search that favored access to either local or global targets. The children with autism were not unusually sensitive to either level of visual structure. In experiment 2 a structural global bias was pitted against an implicit task bias favoring the local level. Children with autism were least sensitive to the structural global bias but showed greater sensitivity to the implicit task bias. This suggests that autism is associated with differences in the executive control processes used to guide attention to either the global or local level, and strategies may be more "data driven".

Attention↗

PubMed2005

Eyes are special but not for everyone: the case of autism.

Current research indicates that human gaze direction is a special cue for shifting attention for one of two reasons: (1) it reflects social desires and intentions and (2) its basic perceptual features usually correspond to important events in the environment. This study, conducted with individuals with autism and with age- and IQ-matched typically developing individuals, dissociates these two often-confounded explanations and demonstrates that eyes appear to be special for typically developing individuals because of their social power, whereas gaze effects are mediated by feature correspondence among persons with autism.

Attention↗

PubMed2004

On mosaics and melting pots: conceptual considerations of comparison and matching strategies.

Conceptual and pragmatic issues relevant to the study of persons with autism are addressed within the context of comparison groups and matching strategies. We argue that no choice of comparison group or matching strategy is perfect, but rather needs to be determined by specific research objectives and theoretical questions. Thus, strategies can differ between studies in which the goal is to delineate developmental profiles and those in which the focus is the study of a specific aspect of functioning. We promote the notion of a "mosaic," rather than a "melting pot," approach to science in which researchers communicate conservative and precise interpretations of empirical findings.

Age Factors↗

PubMed2004

Intact covert orienting to peripheral cues among children with autism.

The focus of the present study was to examine covert orienting responses to peripheral flash cues among children with autism in a situation where attentional processes were taxed by the presence of distractors in the visual field. Fourteen children with autism (MA = 6-7 years) were compared to their MA-matched peers without autism on a forced choice RT covert orienting paradigm. The task conditions varied with regard to the target location, the validity of the cue, and the presence or absence of distractors. The results showed no group differences as both children with autism and their MA-matched peers showed similar effects of cue validity and distractors. These findings are inconsistent with the view that orienting is generally impaired in children with autism.

Adolescent↗

PubMed2003

Locally oriented perception with intact global processing among adolescents with high-functioning autism: evidence from multiple paradigms.

BACKGROUND: According to predictions from the Weak Central Coherence (WCC) theory for perceptual processing, persons with autism should display a tendency to focus on minute details rather than on a more general picture (Frith & Happé, 1994). However, the evidence for this theory is not consistent with findings of an enhanced detection of local targets (Plaisted, O'Riordan, & Baron-Cohen, 1998b; Plaisted, Swettenham, & Rees, 1999), but a typical global bias (Mottron, Burack, Stauder, & Robaey, 1999; Ozonoff, Strayer, McMahon, & Filloux, 1994). METHOD: Adolescents with high-functioning autism and CA- (approximately 15 years) and IQ- (approximately 105-110) matched typically developing adolescents were administered a series of global-local visual tasks, including a traditional task of hierarchical processing, three tasks of configural processing, and a disembedding task that involved rapid perceptual processing. RESULTS: No group differences were found on either the traditional task of hierarchical processing or on tasks of configural processing. However, group differences were found on the disembedding task as the search for embedded, in relation to isolated stimuli, was slower for the typically developing adolescents but similar for the participants with autism. CONCLUSIONS: These findings are consistent with other reports of superior performance in detecting embedded figures (Jolliffe & Baron-Cohen, 1997; Shah & Frith, 1983), but typical performance in global and configural processing (Mottron, Burack et al., 1999; Ozonoff et al., 1994) among persons with high-functioning autism. Thus, the notions of local bias and global impairment that are part of WCC may need to be reexamined.

Adolescent↗

PubMed2002

Benefits and pitfalls in the merging of disciplines: the example of developmental psychopathology and the study of persons with autism.

Recent advances in the discipline of developmental psychopathology highlight the contributions of developmental thought to the study of persons with autism. This article briefly outlines primary developmental innovations in theory, methodology, and the interpretation of findings. Specifically. we discuss two sets of issues that arise from the general notion of developmental level. One set is relevant to the choice of persons that comprise the comparison group and the other to the various implications of the subjects' levels of functioning. In sum, we contend that researchers need to frame their empirical work within the context of developmental theory and methodology and interpret their findings accordingly. This will lead to scientifically compelling work and an increasingly heuristic approach to the study of persons with autism.

Attention Deficit Disorder with Hyperactivity↗