Implicit encoding of extrinsic object properties in stored representations mediating recognition: evidence from shadow-specific repetition priming

Leek, E.C., Davitt, L.I. and Cristino, F. ORCID: 0000-0002-9366-293X, 2015. Implicit encoding of extrinsic object properties in stored representations mediating recognition: evidence from shadow-specific repetition priming. Vision Research, 108, pp. 49-55. ISSN 0042-6989

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Abstract

This study investigated whether, and under what conditions, stored shape representations mediating recognition encode extrinsic object properties of sensory input that vary according to viewing conditions. This was examined in relation to cast shadow. Observers (N=90) first memorised a subset of 3D multi-part novel objects from a limited range of viewpoints rendered with either no shadow, object internal shadow, or both object internal and external (ground) plane shadow. During a subsequent test phase previously memorised targets were discriminated from visually similar distractors across learned and novel views following brief presentation of a same - shape masked prime. The primes contained either matching or mismatching shadow rendering from the training condition. The results showed a recognition advantage for objects memorised with object internal shadow. In addition, objects encoded with internal shadow were primed more strongly by matching internal shadow primes, than by same shape primes with either no shadow or both object internal and external (ground) shadow. This pattern of priming effects generalised to previously unseen views of targets rendered with object internal shadow. The results suggest that the object recognition system contains a level of stored representation at which shape and extrinsic properties of sensory input can be conjointly encoded. Here, this is shown by the conjoint encoding of shape and object internal shadow. We propose that this occurs when cast shadow cannot be discounted during perception on the basis of external cues to the scene lighting model.

Item Type: Journal article
Alternative Title: Shadow and object recognition [running head]
Publication Title: Vision Research
Creators: Leek, E.C., Davitt, L.I. and Cristino, F.
Publisher: Elsevier
Date: March 2015
Volume: 108
ISSN: 0042-6989
Identifiers:
NumberType
10.1016/j.visres.2015.01.011DOI
S0042698915000279Publisher Item Identifier
Divisions: Schools > School of Social Sciences
Depositing User: Linda Sullivan
Date Added: 18 Dec 2017 11:50
Last Modified: 18 Dec 2017 11:57
URI: http://irep.ntu.ac.uk/id/eprint/32200

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