Decoding early and late cortical contributions to individuation of attended and unattended objects

Naughtin, Claire K., Mattingley, Jason B., Bender, Angela D. and Dux, Paul E. (2017) Decoding early and late cortical contributions to individuation of attended and unattended objects. Cortex; A Journal Devoted to the Study of the Nervous System and Behavior, 99 45-54. doi:10.1016/j.cortex.2017.10.013


Author Naughtin, Claire K.
Mattingley, Jason B.
Bender, Angela D.
Dux, Paul E.
Title Decoding early and late cortical contributions to individuation of attended and unattended objects
Journal name Cortex; A Journal Devoted to the Study of the Nervous System and Behavior   Check publisher's open access policy
ISSN 1973-8102
0010-9452
Publication date 2017-11-08
Year available 2017
Sub-type Article (original research)
DOI 10.1016/j.cortex.2017.10.013
Open Access Status Not yet assessed
Volume 99
Start page 45
End page 54
Total pages 10
Place of publication Amsterdam, NX Netherlands
Publisher Elsevier
Language eng
Abstract To isolate a visual stimulus as a unique object with a specific spatial location and time of occurrence, it is necessary to first register (individuate) the stimulus as a distinct perceptual entity. Recent investigations into the neural substrates of object individuation have suggested it is subserved by a distributed neural network, but previous manipulations of individuation load have introduced extraneous visual confounds, which might have yielded ambiguous findings, particularly in early cortical areas. Furthermore, while it has been assumed that selective attention is required for object individuation, there is no definitive evidence on the brain regions recruited for attended and ignored objects. Here we addressed these issues by combining functional magnetic resonance imaging (fMRI) with a novel object-enumeration paradigm in which to-be-individuated objects were defined by illusory contours, such that the physical elements of the display remained constant across individuation conditions. Multi-voxel pattern analyses revealed that attended objects modulated patterns of activity in early visual cortex, as well as frontal and parietal brain areas, as a function of object-individuation load. These findings suggest that object individuation recruits both early and later cortical areas, consistent with theoretical accounts proposing that this operation acts at the junction of feed-forward and feedback processing stages in visual analysis. We also found dissociations between brain regions involved in individuation of attended and unattended objects, suggesting that voluntary spatial attention influences the brain regions recruited for this process.
Keyword Illusory contours
Individuation
Subitizing
fMRI
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID DP110102925
SR120300015
CE140100007
FT120100033
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Queensland Brain Institute Publications
School of Psychology Publications
 
Versions
Version Filter Type
Citation counts: Scopus Citation Count Cited 0 times in Scopus Article
Google Scholar Search Google Scholar
Created: Wed, 29 Nov 2017, 12:03:09 EST