Dynamics of 3D view invariance in monkey inferotemporal cortex

Murty, Apurva Ratan N and Arun, Sripati P (2015) Dynamics of 3D view invariance in monkey inferotemporal cortex. In: JOURNAL OF NEUROPHYSIOLOGY, 113 (7). pp. 2180-2194.

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Abstract

Rotations in depth are challenging for object vision because features can appear, disappear, be stretched or compressed. Yet we easily recognize objects across views. Are the underlying representations view invariant or dependent? This question has been intensely debated in human vision, but the neuronal representations remain poorly understood. Here, we show that for naturalistic objects, neurons in the monkey inferotemporal (IT) cortex undergo a dynamic transition in time, whereby they are initially sensitive to viewpoint and later encode view-invariant object identity. This transition depended on two aspects of object structure: it was strongest when objects foreshortened strongly across views and were similar to each other. View invariance in IT neurons was present even when objects were reduced to silhouettes, suggesting that it can arise through similarity between external contours of objects across views. Our results elucidate the viewpoint debate by showing that view invariance arises dynamically in IT neurons out of a representation that is initially view dependent.

Item Type:	Journal Article
Publication:	JOURNAL OF NEUROPHYSIOLOGY
Publisher:	AMER PHYSIOLOGICAL SOC
Additional Information:	Copy right for this article belongs to the AMER PHYSIOLOGICAL SOC, 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 USA
Keywords:	viewpoint invariance; object recognition; inferior temporal cortex
Department/Centre:	Division of Biological Sciences > Centre for Neuroscience
Date Deposited:	06 Jul 2015 05:26
Last Modified:	06 Jul 2015 05:26
URI:	http://eprints.iisc.ac.in/id/eprint/51787

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