The perception of integrated events in autism spectrum disorders: The role of semantic relatedness and timing

Postgraduate Thesis uoadl:1321445 319 Read counter

Διαπανεπιστημιακό ΠΜΣ Βασική και Εφαρμοσμένη Γνωσιακή Επιστήμη
Library of the School of Science
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Μπακιρτζή Βενετία
Supervisors info:
Αθανάσιος Πρωτόπαπας Αναπλ. Καθηγητής (Επιβλέπων), Αργυρώ Βατάκη Ερευνήτρια στο Ινστιτούτο Γνωσιακής Έρευνας και Τεχνολογίας, Κωνσταντίνος Μουτούσης Αναπλ. Καθηγητής
Original Title:
The perception of integrated events in autism spectrum disorders: The role of semantic relatedness and timing
Translated title:
Η αντίληψη των ενοποιημένων γεγονότων στις διαταραχές του αυτιστικού φάσματος: Ο ρόλος της εννοιολογικής σχέσης και του χρονισμού
The aim of the present study was to dissociate the timing and integration
mechanisms in Autism Spectrum Disorders (ASD). We utilized an identical set of
stimuli in two different tasks - a reaction time (RT) and a simultaneity
judgment (SJ) task. Each task tapped at different hypothesized processes.
Through the RT task, we examined the multisensory integration of ASD children
as compared to a control group. Participants were asked to complete a speeded
detection of two targets, presented unimodally (auditory or visual) or
bimodally (audiovisual) in a congruent or incongruent format. The SJ task
examined the temporal sensitivity in multisensory events of the above-mentioned
groups. Based on recent findings, it was expected that timing and integration
processes would be different rather the same and that ASD individuals would
present integration and timing impairments. Finally, we examined the
relationship between autism and Attentional Deficit Hyperactivity Disorders
(ADHD) symptoms with participants’ performance in both tasks. Results showed
that timing and integration processes are different but interconnected. ASD
participants revealed unimpaired multisensory integration in the RT task and
impaired timing in SJ task. The latter timing impairments affected
participants’ integration capabilities with patients performing similarly for
matching and mismatching presentations. Finally, there was a positive
relationship of autistic and ADHD symptoms with both RT and the SJ tasks,
indicating that autistic symptoms could be an index for slower multisensory
integration and perception of synchrony impairments, however, in any case ADHD
symptoms involvement should be also taken into account.
Autism spectrum disorders, Audiovisual perception, Multisensory processing, Audiovisual integration, Synchrony perception
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