Functional Organization of the Brain during Preparation for Recognition of Image Fragments

Farber, D. A.; Machinskaya, R. I.; Курганский, А. В.; Petrenko, N. E.

doi:10.1007/s11055-015-0185-6

Cited by 7 publications

(4 citation statements)

References 22 publications

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“…The classification findings may be considered surprising given that visual cortex is not traditionally considered to process task rules. However, they are consistent with an expanding body of evidence showing that visual processing is contextual 2 , and that V1 can be “pre-tuned” in preparation for visual perception 49 . Only correct trials were considered in this study.…”

Section: Discussionsupporting

confidence: 85%

Top-down beta oscillatory signaling conveys behavioral context in early visual cortex

Richter

Coppola

Bressler

2018

Sci Rep

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Top-down modulation of sensory processing is a critical neural mechanism subserving numerous important cognitive roles, one of which may be to inform lower-order sensory systems of the current ‘task at hand’ by conveying behavioral context to these systems. Accumulating evidence indicates that top-down cortical influences are carried by directed interareal synchronization of oscillatory neuronal populations, with recent results pointing to beta-frequency oscillations as particularly important for top-down processing. However, it remains to be determined if top-down beta-frequency oscillations indeed convey behavioral context. We measured spectral Granger Causality (sGC) using local field potentials recorded from microelectrodes chronically implanted in visual areas V1/V2, V4, and TEO of two rhesus macaque monkeys, and applied multivariate pattern analysis to the spatial patterns of top-down sGC. We decoded behavioral context by discriminating patterns of top-down (V4/TEO-to-V1/V2) beta-peak sGC for two different task rules governing correct responses to identical visual stimuli. The results indicate that top-down directed influences are carried to visual cortex by beta oscillations, and differentiate task demands even before visual stimulus processing. They suggest that top-down beta-frequency oscillatory processes coordinate processing of sensory information by conveying global knowledge states to early levels of the sensory cortical hierarchy independently of bottom-up stimulus-driven processing.

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Section: Discussionsupporting

confidence: 85%

Top-down beta oscillatory signaling conveys behavioral context in early visual cortex

Richter

Coppola

Bressler

2018

Sci Rep

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“…Namely, HA subjects have lower spectral values in alpha and theta ranges for all 4 s preceding exposure to the pairs of faces either with different or identical expression. The mechanisms of preparation for task performance have been intensively studied [32,[47][48][49][50]. The available data suggest that in healthy subjects a decrease in alpha-rhythm immediately before the target stimulus presentation indicates a state of mental readiness, indispensable for the detection and analysis of objects [50][51][52].…”

Section: Analysis Of Bioelectrical Activity Immediately Preceding Stimentioning

confidence: 99%

“…Analysis of the neurophysiological correlates of preparation for visual recognition, apart from single studies of anxiety disorders [30] and obsessive-compulsive disorders [31], has been performed mainly in healthy subjects [32][33][34]. It is worth noting that preparation for visual recognition is mainly studied for short time periods (no more than 1 second(s) before stimulus presentation).…”

Section: Introductionmentioning

confidence: 99%

“…during 1 s EEG fragments immediately before stimulus presentation. In the current study, several extra conditions were analysed, including: listening to instruction, operative rest (the period between listening to instruction and the beginning of task performance), while the preparation for recognition period was increased to 4 s. In studies on healthy subjects conducted in our laboratory, this approach provided new data pertaining to the state of the subject before testing and during the interstimulus intervals of the cognitive task activities [25][26][27][28][29][30][31][32][33][34][35][36]. The presented methods might be of value for patients not capable, due to some pathological or age restriction, of undergoing or completing standard cognitive testing by EEG recording.…”

Section: Introductionmentioning

confidence: 99%

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Human neurophysiological markers of high anxiety level during preparation for visual recognition

2018

J. Integr. Neurosci.

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The functional state of subjects with high and low levels of anxiety is studied by electroencephalograph analysis of different temporal periods preceding a cognitive task of visual expression recognition. Several conditions are investigated: background/eyes closed; background/eyes opened; listening to instructions for the cognitive task; operative rest (time lapse between listening to instructions and the beginning of the task); as well as short intervals immediately preceding exposure to target stimuli (preparatory stage), which were paired facial images with identical or different emotional expressions. At all these pre-task stages, high-anxiety subjects exhibit much lower electroencephalograph amplitude values for alpha and theta bands (as compared with low-anxiety subjects). The most prominent differences in electroencephalograph amplitude values revealed during the phases of listening to instructions and operative rest. These datum may provide more precise electrophysiological markers of the level of anxiety during conditions preceding cognitive task performance.

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Top-Down Beta Oscillatory Signaling Conveys Behavioral Context to Primary Visual Cortex

Richter

Coppola

Bressler

2016

Preprint

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23 24Top-down modulation of sensory processing is a critical neural mechanism 25 subserving a number of important cognitive roles. Principally, top-down 26 influences appear to inform lower-order sensory systems of the current 'task at 27hand', and thus may convey behavioral context to these systems. Accumulating of top-down directed beta-frequency influences, we measured spectral Granger 37 Causality using local field potentials recorded from microelectrodes chronically 38 implanted in visual cortical areas V1, V4, and TEO, and then applied multivariate 39 pattern analysis to the spatial patterns of top-down spectral Granger Causality in 40 the visual cortex. We decoded behavioral context by discriminating patterns of 41 top-down (V4/TEO à V1) beta-peak spectral Granger Causality for two different 42 task rules governing the correct responses to visual stimuli. The results indicate 43 that top-down directed influences in visual cortex are carried by beta oscillations, 44and differentiate current task demands even before visual stimulus processing. 45All rights reserved. No reuse allowed without permission.

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Functional Organization of the Brain during Preparation for Recognition of Image Fragments

Cited by 7 publications

References 22 publications

Top-down beta oscillatory signaling conveys behavioral context in early visual cortex

Top-down beta oscillatory signaling conveys behavioral context in early visual cortex

Human neurophysiological markers of high anxiety level during preparation for visual recognition

Top-Down Beta Oscillatory Signaling Conveys Behavioral Context to Primary Visual Cortex

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