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Transauricular Vagus Nerve Stimulation and Electroencephalographic Assessment in Disorders of Consciousness

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Ensemble Statistics Can Be Available before Individual Item Properties: Electroencephalography Evidence Using the

Michael L Epstein¹, Tatiana A Emmanouil^1,2

¹Program in Psychology, The Graduate Center, City University of New York.

Journal of Cognitive Neuroscience

|August 24, 2021

Summary

Ensemble perception, the rapid processing of group statistics, occurs faster than individual object perception. This electroencephalography study reveals that visual ensemble properties are perceived sooner than individual object details.

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Area of Science:

Cognitive Neuroscience
Visual Perception

Background:

Behavioral studies suggest rapid statistical property perception in object groups.
The precise timing of ensemble perception in vision remains an open question.

Purpose of the Study:

To directly compare the neural timing of ensemble perception versus individual object processing.
To investigate the speed of ensemble perception using electroencephalography (EEG).

Main Methods:

Utilized an oddball task with sequentially flashed line sets, presenting individual or ensemble orientation oddballs.
Recorded event-related potentials (ERPs), focusing on the P3b component, and employed multivariate pattern analysis (MVPA).
EEG analysis compared the latency of P3b components for ensemble and individual oddballs.

Main Results:

P3b components were observed for both individual and ensemble oddballs at parietal electrodes.
Ensemble P3b components occurred significantly earlier than individual P3b components.
MVPA showed ensemble oddball trials were classified earlier than individual oddball trials.

Conclusions:

Ensemble perception is a rapid visual process.
Visual ensemble properties are processed and available earlier than individual object properties.