Early information processing contributions to object individuation revealed by perception of illusory figures

Naughtin, Claire K., Mattingley, Jason B. and Dux, Paul E. (2016) Early information processing contributions to object individuation revealed by perception of illusory figures. Journal of Neurophysiology, 116 6: 2513-2522. doi:10.1152/jn.00082.2016


Author Naughtin, Claire K.
Mattingley, Jason B.
Dux, Paul E.
Title Early information processing contributions to object individuation revealed by perception of illusory figures
Journal name Journal of Neurophysiology   Check publisher's open access policy
ISSN 1522-1598
0022-3077
Publication date 2016-12-01
Sub-type Article (original research)
DOI 10.1152/jn.00082.2016
Open Access Status Not yet assessed
Volume 116
Issue 6
Start page 2513
End page 2522
Total pages 10
Place of publication Bethesda, MD, United States
Publisher American Physiological Society
Language eng
Abstract To isolate multiple coherent objects from their surrounds, each object must be represented as a stable perceptual entity across both time and space. Recent theoretical and empirical work has proposed that this process of object individuation is a mid-level operation that emerges around 200–300 ms after stimulus onset. However, this hypothesis is based on paradigms that have potentially obscured earlier effects. Furthermore, no study to date has directly assessed whether object individuation occurs for task-irrelevant objects. In the present study we used electroencephalography (EEG) to measure the time course of individuation, for stimuli both within and outside the focus of attention, to assess the information processing stage at which object individuation arises for both types of objects. We developed a novel paradigm involving items defined by illusory contours, which allowed us to vary the number of to-be-individuated objects while holding the physical elements of the display constant (a design characteristic not present in earlier work). As early as 100 ms after stimulus onset, event-related potentials tracked the number of objects in the attended hemifield, but not those in the unattended hemifield. By contrast, both attended and unattended objects could be individuated at a later stage. Our findings challenge recent conceptualizations of the time course of object individuation and suggest that this process arises earlier for attended than unattended items, implying that voluntary spatial attention influences the time course of this operation.
Keyword ERP
Illusory contours
N2pc
Object individuation
P1
Selective attention
Q-Index Code C1
Q-Index Status Provisional Code
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: TR Web of Science Citation Count  Cited 1 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 1 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Tue, 27 Dec 2016, 10:43:01 EST by System User on behalf of Learning and Research Services (UQ Library)