The effect of variability of unattended information on global and local processing: evidence for lateralization at early stages of processing

Evans, M.A; Shedden, Judith M.; Hevenor, Stephanie J.; Hahn, Mark C.

doi:10.1016/s0028-3932(99)00080-9

Cited by 97 publications

(85 citation statements)

References 33 publications

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“…However, we are not the Wrst observing such early asymmetries. Similar eVects were also reported by Evans et al (2000). One factor for P1 asymmetries is possibly the eVort for selecting the letter at the target level.…”

Section: Discussionsupporting

confidence: 84%

“…One factor for P1 asymmetries is possibly the eVort for selecting the letter at the target level. As in the Evans et al (2000) study, in the present experiment the target selection was rather easy because the stimulus always occurred at the same position and the preparation interval was long (800 ms compared to 350 ms in Malinowski et al 2002, or to 600 ms in Volberg and Hübner 2004). Nevertheless, it remains unclear why early lateralization occurs under such conditions.…”

Section: Discussionmentioning

confidence: 64%

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Do the hemispheres differ in their preparation for global/local processing?

Volberg

Hübner

2006

Exp Brain Res

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It has recently been suggested that hemispheric diVerences for global and local processing already occur in response to visual pre-cues that direct attention to a speciWc level. However, in the supporting studies cue information was confounded with the form of the cues. In order to dissolve the confound, we compared event-related brain potentials towards cues diVering in form with those towards identically formed color cues. As a result, hemispheric diVerences were found only for the former cue type. The data thus show that the mere cue information does not produce hemispheric asymmetries associated with global/local target stimulus processing.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 64%

Do the hemispheres differ in their preparation for global/local processing?

Volberg

Hübner

2006

Exp Brain Res

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“…Early visual areas would be more activated by selective attention to local features in the left hemisphere and by attention to global information in the right hemisphere (Fink et al, 1996(Fink et al, , 1997Proverbio et al, 1998;Evans et al, 2000;Han et al, 2002). Although, to our knowledge, there is no data clearly showing the same hemispheric specialization between the auditory cortices, our findings suggest such an asymmetry.…”

Section: Hemispheric Specializationmentioning

confidence: 41%

Effects of Selective Attention on the Electrophysiological Representation of Concurrent Sounds in the Human Auditory Cortex

Bidet-Caulet

Fischer²,

Besle³

et al. 2007

J. Neurosci.

204

173

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In noisy environments, we use auditory selective attention to actively ignore distracting sounds and select relevant information, as during a cocktail party to follow one particular conversation. The present electrophysiological study aims at deciphering the spatiotemporal organization of the effect of selective attention on the representation of concurrent sounds in the human auditory cortex. Sound onset asynchrony was manipulated to induce the segregation of two concurrent auditory streams. Each stream consisted of amplitude modulated tones at different carrier and modulation frequencies. Electrophysiological recordings were performed in epileptic patients with pharmacologically resistant partial epilepsy, implanted with depth electrodes in the temporal cortex. Patients were presented with the stimuli while they either performed an auditory distracting task or actively selected one of the two concurrent streams. Selective attention was found to affect steady-state responses in the primary auditory cortex, and transient and sustained evoked responses in secondary auditory areas. The results provide new insights on the neural mechanisms of auditory selective attention: stream selection during sound rivalry would be facilitated not only by enhancing the neural representation of relevant sounds, but also by reducing the representation of irrelevant information in the auditory cortex. Finally, they suggest a specialization of the left hemisphere in the attentional selection of fine-grained acoustic information.

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“…Current theories assume parallel and concurrent processing of the different dimensions of local-global stimuli (Hoffman, 1980;Madden et al, 1996), where global interference arises from the inhibition of local pathways by those carrying global information (Christman, 2001;Hughes, 1986;Kitterle et al, 1993). Evidence from brain lesion studies (Delis et al, 1986(Delis et al, ,1988Robertson et al, 1988Yamaguchi et al, 2000) and neuroimaging studies in healthy participants (Evans et al, 2000;Fink et al, 1996Fink et al, ,1999Han et al, 2002;Weber et al, 2000;Yamaguchi et al, 2000) indicates that local and global processing proceeds in parallel, with the left hemisphere assuming a local and the right hemisphere a global processing advantage.…”

Section: Introductionmentioning

confidence: 99%

Local–global interference is modulated by age, sex and anterior corpus callosum size

et al. 2007

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To identify attentional and neural mechanisms affecting global and local feature extraction, we devised a global-local hierarchical letter paradigm to test the hypothesis that aging reduces functional cerebral lateralization through corpus callosum (CC) degradation. Participants (37 men and women, 26-79 years) performed a task requiring global, local, or global+local attention and underwent structural MRI for CC measurement. Although reaction time (RT) slowed with age, all participants had faster RTs to local than global targets. This local precedence effect together with greater interference from incongruent local information and greater response conflict from local targets each correlated with older age and smaller callosal genu (anterior) areas. These findings support the hypothesis that the CC mediates lateralized local-global processes by inhibition of task-irrelevant information under selective attention conditions. Further, with advancing age smaller genu size leads to less robust inhibition, thereby reducing cerebral lateralization and permitting interference to influence processing. Sex was an additional modifier of interference, in that callosum-interference relationships were evident in women but not in men. Regardless of age, smaller splenium (posterior) areas correlated with less response facilitation from repetition priming of global targets in men, but with greater response facilitation from repetition priming of local targets in women. Our data indicate the following dissociation: Anterior callosal structure was associated with inhibitory processes (i.e., interference from incongruency and response conflict), which are vulnerable to the effects of age and sex, whereas posterior callosal structure was associated with facilitation processes from repetition priming dependent on sex and independent of age.

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The effect of variability of unattended information on global and local processing: evidence for lateralization at early stages of processing

Cited by 97 publications

References 33 publications

Do the hemispheres differ in their preparation for global/local processing?

Do the hemispheres differ in their preparation for global/local processing?

Effects of Selective Attention on the Electrophysiological Representation of Concurrent Sounds in the Human Auditory Cortex

Local–global interference is modulated by age, sex and anterior corpus callosum size

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