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Neural representation of objects in space: a dual coding account

G W Humphreys¹

¹Cognitive Science Research Centre, School of Psychology, University of Birmingham, Edgbaston, UK.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences

|October 14, 1998

Summary

The brain uses distinct object coding systems for visual selective attention. These systems involve within-object and between-object representations, influencing how we perceive and interact with our environment.

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Area of Science:

Neuroscience
Cognitive Psychology
Visual Perception

Background:

Models of visual selective attention are informed by how the brain codes objects.
Understanding spatial representation is crucial for explaining visual processing limitations.

Purpose of the Study:

To investigate the nature of object coding in the brain.
To explore the implications of object coding for visual selective attention models.

Main Methods:

Neuropsychological studies examining task-based constraints on visual neglect, reading, and counting.
Analysis of spatial representation forms for objects: within-object and between-object coding.

Main Results:

Evidence for parallel spatial representations: within-object (parts of objects) and between-object (independent objects).
Limited coding of spatial position per se, with poor memory for small spatial displacements across eye movements.
Object coding moderates spatial effects on visual selection, overriding element separation in some cases.

Conclusions:

Visual processing is constrained by competition in coding object parts, the limited number of parallel object codes, and task-dependent selection of coding types.
Between-object coding may involve the dorsal visual system; within-object coding likely involves the ventral system.
Dorsal system involvement is possible for attention shifts within objects or when spatial coding is vital for identification.