Double dissociation of frequency-dependent resonance properties in early and higher visual ventral cortex
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1
INSERM, France
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2
Weizmann Institute of Science, Switzerland
Frequency effects on hemodynamic responses to functional activation have been extensively investigated with a focus on primary cortices and simple stimuli or motor acts but only rarely with semantically meaningful material (McKeeff et al., 2007). In our fMRI study, subjects were instructed to maintain fixation while a face and a house picture were periodically alternated at frame durations ranging from 33 to 4800 ms/picture. To discriminate the hypothesized resonance effects with an intrinsic sampling frequency from effects due to sensory integration length, we also - for a fixed stimulus onset asynchrony (SOA) - varied frame lengths within this range. Finally, we compared passive viewing with an active but incidental task. Tuning profiles, effects of frame duration for a fixed SOA and effects of attention differed between early and higher levels of the visual hierarchy. In V1/V2, the average fMRI response was highest with 100ms frame lengths. During both active and passive viewing responses dropped off with slower alternations but for faster alternation only with passive viewing. For a given SOA, responses increased linearly with frame length, indicating a benefit from longer stimulus exposure. In semantically relevant extrastriate areas, as the fusiform face area and the parahippocampal place area, responses peaked at slower frame alternations than in V1/V2 but for a given long SOA, even short frame lengths generated already the same response as longer ones. Attention enhanced responses at slower frame alternations. Together, neural responses seem to reflect sampling frequencies that slow down along the visual hierarchy. Attention may disrupt rapid cyclic sensory clearance in early visual cortex and entrain slow top-down amplification in higher tier visual cortex.
Keywords:
Cognition,
fMRI
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 Cognition and Attention
Citation:
Gauthier
B,
Hesselmann
G,
Eger
E,
Anne-lise
G and
Andreas
K
(2011). Double dissociation of frequency-dependent resonance properties in early and higher visual ventral cortex.
Conference Abstract:
XI International Conference on Cognitive Neuroscience (ICON XI).
doi: 10.3389/conf.fnhum.2011.207.00423
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Received:
24 Nov 2011;
Published Online:
28 Nov 2011.
*
Correspondence:
Dr. Baptiste Gauthier, INSERM, Gif-sur-Yvette, France, gauthierb.ens@gmail.com