Neuroscience 2000 Abstract
| Presentation Number: | 53.18 |
|---|---|
| Abstract Title: | Temporal dynamics of the neural responses to the luminances of the surface stimuli in macaque striate cortex (V1). |
| Authors: |
Kinoshita, M.*1
; Komatsu, H.1
1Lab of Neural Control, Natl Inst for Physiol Sci, Okazaki, Japan |
| Primary Theme and Topics |
F. Sensory Systems - 79. Visual cortex: striate |
| Session: |
53. Visual cortex: striate--functional organization I Poster |
| Presentation Time: | Sunday, November 5, 2000 9:00 AM-10:00 AM |
| Location: | Hall G-J |
| Keywords: | MONKEY, BRIGHTNESS PERCEPTION, CONTEXTUAL MODULATION, VISUAL CORTEX |
We have previously reported that there are neurons in macaque V1 whose responses correlated with the luminance or the brightness of the surface stimulus covering the entire receptive field (SFN Abstract 1998, 254.15). In order to understand the temporal dynamics of such responses, we compared the response profiles (the way in which surface luminance affects the response) between the early period of the response (120-220 ms from stimulus onset) and the later period (later than 320 ms). We recorded the responses of V1 neurons to various luminances of the surface stimuli while monkeys performed a fixation task. About half of the 120 neurons examined exhibited changes of the response profile across different periods. In about 60% of these neurons, the response profile in the early period had V-shape, that is, the response was dependent on the absolute value of the luminance contrast between the stimulus and the background, whereas that in the later period exhibited monotonic change (increase or decrease) depending on the luminance of the surface. In contrast, only about 5% of the neurons, whose profile changed, showed the opposite way of the change in the response profile, that is, the early period exhibited the monotonic change and the later period exhibited the V-shape. Similarly, monotonic change of the response due to the luminance of the surround was more obvious in the later period of the response. The monotonic response profile should provide better representation of the surface luminance than the V-shaped profile. The present results suggest that the representation of the surface luminance and brightness develops with time in V1 neurons.
Supported by JSPS-RFTF96L00202
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2000 Neuroscience Meeting Planner. New Orleans, LA: Society for Neuroscience, 2000. Online.
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