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Unformatted text preview: nt timing. In each experimental session, the
eural stimulus selectivity of several neighbouring cortical sites was ﬁrst
termined in a ﬁxation task using luminance-matched face and non-face
eyscale images. Then, in the second part of the experiment (a), face and
on-face images with varying amounts of noise were used in a face
tegorization task. b, Timing of events in each categorization trial. One of
e four possible microstimulation conditions shown was applied randomly
ehran, 19395, Iran. 2Research Center for Brain and Cognitive Sciences,
385, Iran. Afraz, Kiani, Esteky (2006) as a
elivered at 200 Hz (refs 19, 20). The stimulation pulses were microstimulation time conditions caused a signiﬁcant shift in
iphasic, with the cathodal pulse leading. Each pulse was 0.2 msthe psychometric functions compared to the non-stimulated
uration with 0.1 ms between the cathodal and anodal phase....
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- Spring '12