Now you see it, now you don’t: surround suppression of bold is predictive of perceptual pop-out
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1
Utrecht University, Netherlands
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2
UMC Utrecht, Netherlands
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3
University of Amsterdam, Netherlands
When an object differs markedly from its background environment it is more likely to capture attention. This perceptual pop-out effect has been attributed to surround suppression in V1. In human fMRI studies, surround suppression has been shown to result in lower BOLD signal, but the link with visual search performance has not been made so far. The aim of the current study is to establish this link. We compared BOLD amplitudes in response to circular textures consisting of either homogeneously (HT) or inhomogeneously (IhT) oriented gabor patches. We expected that HTs will elicit more suppression than IhTs. The results indicated that this is indeed the case with lower BOLD amplitudes in response to HTs than IhTs. Furthermore, the results indicate that surround suppression originates in V1, and the effects of surround suppression gets carried forward to higher-level visual areas. Outside the scanner, the participants also had to perform a target-detection task with similar stimuli. In this task, the targets had either SIMILAR, DIFFERENT, RANDOM or NO surround. Reaction times and accuracy to targets embedded in homogeneous, but DIFFERENT, surround and to targets presented in isolation (NONE) did not differ. In contrast, highly SIMILAR surround interfered with target detection to a similar degree as RANDOM surround. Behavioural results suggest that target pop-out facilitates visual search considerably more when the ratio between inhibition levels at target location and in the surround is large. Based on the idea that surround suppression arises in the V1, we designed stimuli that mimic the properties of population receptive fields in V1 and, as a control, V3. Both behavioural and fMRI effects were more pronounced for stimuli optimized for V1 response properties. Funding: Supported by NWO (Dutch scientific organisation) Vici grant to Prof. Chantal Kemner.
Keywords:
BOLD,
Perception
Conference:
XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011.
Presentation Type:
Poster Presentation
Topic:
Poster Sessions: Neurophysiology of Sensation and Perception
Citation:
Milivojevic
B,
Raemaekers
M,
Jansma
JM,
Ramsey
N,
Calabrese
M and
Kemner
C
(2011). Now you see it, now you don’t: surround suppression of bold is predictive of perceptual pop-out.
Conference Abstract:
XI International Conference on Cognitive Neuroscience (ICON XI).
doi: 10.3389/conf.fnhum.2011.207.00341
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Received:
23 Nov 2011;
Published Online:
28 Nov 2011.
*
Correspondence:
Dr. Branka Milivojevic, Utrecht University, Utrecht, Netherlands, b.milivojevic@donders.ru.nl