No evidence for early modulation of evoked responses in primary visual cortex to irrelevant probe stimuli presented during the attentional blink

Jacoby, Oscar, Visser, Troy A. W., Hart, Bianca C., Cunnington, Ross and Mattingley, Jason B. (2011) No evidence for early modulation of evoked responses in primary visual cortex to irrelevant probe stimuli presented during the attentional blink. PloS One, 6 8: 8 Article # e24255. doi:10.1371/journal.pone.0024255


Author Jacoby, Oscar
Visser, Troy A. W.
Hart, Bianca C.
Cunnington, Ross
Mattingley, Jason B.
Title No evidence for early modulation of evoked responses in primary visual cortex to irrelevant probe stimuli presented during the attentional blink
Journal name PloS One   Check publisher's open access policy
ISSN 1932-6203
Publication date 2011-08-01
Year available 2011
Sub-type Article (original research)
DOI 10.1371/journal.pone.0024255
Open Access Status DOI
Volume 6
Issue 8
Start page 8 Article # e24255
Total pages 7
Place of publication San Francisco, CA, United States
Publisher Public Library of Science
Language eng
Subject 2700 Medicine
1300 Biochemistry, Genetics and Molecular Biology
1100 Agricultural and Biological Sciences
Abstract Background: During rapid serial visual presentation (RSVP), observers often miss the second of two targets if it appears within 500 ms of the first. This phenomenon, called the attentional blink (AB), is widely held to reflect a bottleneck in the processing of rapidly sequential stimuli that arises after initial sensory registration is complete (i.e., at a relatively late, post-perceptual stage of processing). Contrary to this view, recent fMRI studies have found that activity in the primary visual area (V1), which represents the earliest cortical stage of visual processing, is attenuated during the AB. Here we asked whether such changes in V1 activity during the AB arise in the initial feedforward sweep of stimulus input, or instead reflect the influence of feedback signals from higher cortical areas.
Formatted abstract
Background: During rapid serial visual presentation (RSVP), observers often miss the second of two targets if it appears within 500 ms of the first. This phenomenon, called the attentional blink (AB), is widely held to reflect a bottleneck in the processing of rapidly sequential stimuli that arises after initial sensory registration is complete (i.e., at a relatively late, postperceptual stage of processing). Contrary to this view, recent fMRI studies have found that activity in the primary visual area (V1), which represents the earliest cortical stage of visual processing, is attenuated during the AB. Here we asked whether such changes in V1 activity during the AB arise in the initial feedforward sweep of stimulus input, or instead reflect the influence of feedback signals from higher cortical areas.
Methodology/Principal Findings: EEG signals were recorded while participants monitored a sequential stream of distractor letters for two target digits (T1 and T2). Neural responses associated with an irrelevant probe stimulus presented simultaneously with T2 were measured using an ERP marker – the C1 component – that reflects initial perceptual processing of visual information in V1. As expected, T2 accuracy was compromised when the inter-target interval was brief, reflecting an AB deficit. Critically, however, the magnitude of the early C1 component evoked by the probe was not reduced during the AB.
Conclusions/Significance: Our finding that early sensory processing of irrelevant probe stimuli is not suppressed during the AB is consistent with theoretical models that assume that the bottleneck underlying the AB arises at a post-perceptual stage of processing. This suggests that reduced neural activity in V1 during the AB is driven by re-entrant signals from extrastriate areas that regulate early cortical activity via feedback connections with V1.
Keyword Spatial Attention
Conscious Perception
Brain
Selection
Potentials
Component
Striate
Events
Areas
Consolidation
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID DP110102925
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Brain Institute Publications
Official 2012 Collection
School of Psychology Publications
 
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