A signal detection procedure eliminates priming biases in dichotic listening

Hiscock, Merrill; Mackay, Marilynn

doi:10.1016/0028-3932(87)90075-3

Cited by 12 publications

(2 citation statements)

References 32 publications

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“…The specialized neuronal substrates for language remain fixed and unalterable, but the measured REA can fluctuate in response to attentional and perceptual requirements. Particularly significant, in this regard, Hiscock and colleagues directly challenged the “structural theory” in a series of FA dichotic experiments that discovered and experimentally manipulated “priming” or carryover effects (Hiscock & Kinsbourne, 1980; Hiscock, Kinsbourne, Caplan, & Swanson, 1979; Hiscock & Mackay, 1987; Hiscock & Stewart, 1984). Priming as operationally defined in these studies refers to difficulty switching attention between ears to recall a second block of trials following sustained attention to the other ear for a block of trials.…”

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Forced-Attention Dichotic Listening With University Students With Dyslexia

Kershner

2014

J Learn Disabil

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Rapidly changing environments in day-to-day activities, enriched with stimuli competing for attention, require a cognitive control mechanism to select relevant stimuli, ignore irrelevant stimuli, and shift attention between alternative features of the environment. Such attentional orchestration is essential to the acquisition of reading skills. In the present forced attention dichotic listening study, adults with moderate and severe dyslexia and nondisabled adults were tested on their ability to switch attention between ears for immediate recall. Blocks of pairs of consonant-vowel syllables were counterbalanced into left-ear first or right-ear first ordered conditions. Significant order effects showed that only those with severe dyslexia were poorer in switching attention to the left ear, whereas both groups with dyslexia were poorer switching attention to the right ear. Shifting left appears to be a normative function of reading level, whereas inferior ability to disengage attending to the left ear to report from the right ear qualifies as a dysfunctional facet of dyslexia with etiological significance. No support was found for the traditional proposition that dyslexia may be associated with atypical left hemisphere lateralization. Combining these results with previous dichotic and neuroimaging research implicates a dysfunctional frontostriatal cognitive control network in dyslexia. With due caution, the results suggest that a neurobiological feature of dyslexia may be a lack of control in downwardly modulating excessive left inferior frontal cortex activations. The results are consistent with impoverished connectedness between left anterior and posterior language areas and, pending future confirmation of these findings, suggest the need for a reconceptualization of remedial programming.

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Forced-Attention Dichotic Listening With University Students With Dyslexia

Kershner

2014

J Learn Disabil

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“…Merrill C. Hiscock, in Saskatoon at the University Hospital through much of the 1980s, researched numerous facets of hemispheric asymmetry and laterality in both children and adults. Studies with adults included the investigation of interference in concurrent performance of verbal and manual tasks (Hiscock & Chipuer, 1986), the application of signal detection procedures to eliminate priming biases in dichotic listening tasks (Hiscock & Mackay, 1987), as well as the effects of eye movements (Hiscock, Hampson, Wong, & Kinsbourne, 1985) and asymmetrically focussed attention (Hiscock & Stewart, 1984) on dichotic listening task performance. Hiscock also investigated various parameters of dual task performance as it relates to lateralization in children (e.g., Hiscock, Antoniuk, Prisciak, & von Hessert, 1985; Hiscock, Kinsbourne, Samuels, & Krause, 1987).…”

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Human neuropsychology in Canada: The 1980s.

Fuerst¹,

Rourke²

1995

Canadian Psychology / Psychologie canadienne

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This article presents an overview of research activity in the field of human neuropsychology that has been carried out in Canada during the 1980s. Included are brief descriptions of investigations of many facets of the neuropsychology of both children and adults conducted by prominent researchers at major institutions across the country. The work reviewed herein serves to illustrate the rather extensive commitment to research in human neuropsychology that has been made by investigators in Canada. It is clear that Canadian leadership in this important area of scientific endeavour can be expected to continue.

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Progress in the measurement of laterality and implications for dyslexia research

Hiscock

Kinsbourne

1995

Annals of Dyslexia

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Much of contemporary laterality research has been motivated by a need to increase the accuracy with which individuals can be classified as left- or right-hemisphere dominant for speech and language. Efforts to improve the classification accuracy of laterality methods have led not only to the refinement of laterality methods but also to the discovery of some of the mechanisms that contribute to asymmetric performance. Despite these advances, laterality methods still do not lead to definitive conclusions about hemispheric specialization in the individual case, and special caution must be used when interpreting results for individual dyslexic children. Event-related measurements of cerebral metabolism, still in the development phase, promise to complement but not replace behavioral laterality methods.

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A signal detection procedure eliminates priming biases in dichotic listening

Cited by 12 publications

References 32 publications

Forced-Attention Dichotic Listening With University Students With Dyslexia

Forced-Attention Dichotic Listening With University Students With Dyslexia

Human neuropsychology in Canada: The 1980s.

Progress in the measurement of laterality and implications for dyslexia research

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