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Colour expectations during object perception are associated with early and late modulations of electrophysiological activity.

Abstract：

:It is well known that visual expectation and attention modulate object perception. Yet, the mechanisms underlying these top-down influences are not completely understood. Event-related potentials (ERPs) indicate late contributions of expectations to object processing around the P2 or N2. This is true independent of whether people expect objects (vs. no objects) or specific shapes, hence when expectations pertain to complex visual features. However, object perception can also benefit from expecting colour information, which can facilitate figure/ground segregation. Studies on attention to colour show attention-sensitive modulations of the P1, but are limited to simple transient detection paradigms. The aim of the current study was to examine whether expecting simple features (colour information) during challenging object perception tasks produce early or late ERP modulations. We told participants to expect an object defined by predominantly black or white lines that were embedded in random arrays of distractor lines and then asked them to report the object's shape. Performance was better when colour expectations were met. ERPs revealed early and late phases of modulation. An early modulation at the P1/N1 transition arguably reflected earlier stages of object processing. Later modulations, at the P3, could be consistent with decisional processes. These results provide novel insights into feature-specific contributions of visual expectations to object perception.

journal_name

Exp Brain Res

journal_title

Experimental brain research

authors

Stojanoski BB,Niemeier M

doi

10.1007/s00221-015-4362-1

subject

Has Abstract

pub_date

2015-10-01 00:00:00

pages

2925-34

issue

10

eissn

0014-4819

issn

1432-1106

pii

10.1007/s00221-015-4362-1

journal_volume

233

pub_type

杂志文章

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