Abstract：
:This study was designed to separate the neural response associated with awareness of a visual object from the neural responses to the visual input without awareness. Two classes of stimuli were presented to subjects: (1) a field of randomly positioned and oriented Gabor patches (no contour) or (2) the same field of Gabor patches in which a subset of the Gabor patches were oriented in such a way as to give rise to the percept of an ellipse (contour). To measure the electroencephalograph (EEG) responses to the contour without awareness, trials during which a contour was present but not perceived were compared to trials where no contour was present and its absence was correctly indicated. At beta frequencies, the presence of the contour reduced the evoked potential (EP) power approximately 130-230 ms post-stimulus. Coherence in the theta band were also reduced when a contour was present but not perceived. Thus, modulations of the EP take place when a contour is presented even without the subjects' awareness. To explore the correlates of awareness, trials during which the subject correctly indicated the presence of a contour were compared to trials in which the object was not detected. Consistent across subjects, awareness caused an increase in the EP power in the beta range around 130-230 ms post-stimulus. These results suggest that the neural response to an object and awareness of that object are dissociable in EEG recordings.
journal_name
Behav Brain Resjournal_title
Behavioural brain researchauthors
Tarokh Ldoi
10.1016/j.bbr.2008.07.026subject
Has Abstractpub_date
2009-01-03 00:00:00pages
55-62issue
1eissn
0166-4328issn
1872-7549pii
S0166-4328(08)00393-8journal_volume
196pub_type
杂志文章,随机对照试验abstract：:The Morris water maze (MWM) has been used to assess cognitive function in rats after a variety of lesions designed to model brain damage and to assess the effects of drugs, growth factors, and neural transplants on post-operative deficits. The present study examined recovery of spatial navigation in the MWM over time ...
journal_title：Behavioural brain research
pub_type： 杂志文章
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journal_title：Behavioural brain research
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journal_title：Behavioural brain research
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journal_title：Behavioural brain research
pub_type： 杂志文章
doi：10.1016/s0166-4328(96)02261-9
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journal_title：Behavioural brain research
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更新日期：2007-01-25 00:00:00
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journal_title：Behavioural brain research
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journal_title：Behavioural brain research
pub_type： 杂志文章
doi：10.1016/s0166-4328(03)00077-9
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journal_title：Behavioural brain research
pub_type： 杂志文章,评审
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journal_title：Behavioural brain research
pub_type： 杂志文章
doi：10.1016/j.bbr.2011.07.045
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journal_title：Behavioural brain research
pub_type： 杂志文章
doi：10.1016/s0166-4328(99)00060-1
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journal_title：Behavioural brain research
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journal_title：Behavioural brain research
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journal_title：Behavioural brain research
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journal_title：Behavioural brain research
pub_type： 杂志文章
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