Atypical brain laterality in adults with ADHD during dichotic listening for emotional intonation and words.

TitleAtypical brain laterality in adults with ADHD during dichotic listening for emotional intonation and words.
Publication TypeJournal Article
Year of Publication2006
AuthorsHale, ST, Zaidel E, McGough JJ, Phillips JM, McCracken JT
JournalNeuropsychologia
Volume44
Issue6
Pagination896-904
Date Published2006
ISSN0028-3932
KeywordsAcoustic Stimulation, Adult, Attention, Attention Deficit Disorder with Hyperactivity, Brain, Dichotic Listening Tests, Emotions, Female, Functional Laterality, Hearing, Humans, Male, Reaction Time
Abstract

Few studies directly examined the nature of hemispheric specialization and interaction in ADHD. The present experiment investigated left/right brain dynamics in unmedicated right handed adults with ADHD (n = 19) and in controls (n = 19), using a dichotic listening task to assess hemispheric differences in word and emotion recognition. We also assessed how focusing attention on a single ear modulated lateralized performance and affected cross-callosal interference effects. Analysis of variance indicated that ADHD subjects showed reduced left hemisphere specialization, were better at processing emotions, and worse at processing words compared to controls. These differences were eliminated during focused attention. Finally, during presumed right hemisphere processing of linguistic stimuli, subjects with ADHD showed reduced left hemisphere interference. We concluded that ADHD subjects demonstrated greater right hemisphere and reduced left hemisphere contribution during this task relative to controls. We posit that these hemispheric differences were due to management or use of available cognitive resources rather than inherent capacity.

DOI10.1016/j.brat.2011.06.001
Alternate JournalNeuropsychologia