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Related Experiment Video

Updated: Jun 5, 2026

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

Published on: August 1, 2018

Object-based selection from spatially-invariant representations: evidence from a feature-report task.

Michi Matsukura¹, Shaun P Vecera

¹Department of Psychology, University of Iowa, E11 Seashore Hall, Iowa City, IA 52242-1407, USA. michi-matsukura@uiowa.edu

Attention, Perception & Psychophysics

|January 26, 2011

Summary

This summary is machine-generated.

Object-based attention enhances feature identification from single objects. Foreknowledge of features strengthens this effect, while strong perceptual cues are crucial when such knowledge is absent.

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Last Updated: Jun 5, 2026

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

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Area of Science:

Cognitive Psychology
Visual Attention Research

Background:

Attention can select objects or locations, influencing perception.
Object-based attention, where attention selects features of a single object, is a well-documented phenomenon.
Previous research suggests object-based attention operates at late visual processing stages, independent of spatial information.

Purpose of the Study:

To investigate the role of foreknowledge in object-based attention.
To determine the mechanisms driving object selection in the absence of foreknowledge.
To explore how stimuli establish objecthood for attentional selection.

Main Methods:

A feature-report task was employed to assess attention.
Part I manipulated observers' foreknowledge of to-be-reported features.
Part II examined object selection without foreknowledge, focusing on perceptual cues.

Main Results:

A significant object-based effect was found when features were known in advance.
The object-based effect diminished when advance knowledge of features was absent.
Strong perceptual cues were necessary for object selection when foreknowledge was lacking.

Conclusions:

Foreknowledge of features facilitates object-based attentional selection.
In the absence of foreknowledge, robust perceptual cues are essential for stimuli to be treated as distinct objects for attention.
This highlights the interplay between top-down (foreknowledge) and bottom-up (perceptual cues) factors in object-based attention.