Abstract
The inverse relationship between flash intensity and response times was studied under identical conditions using two different response measures, saccadic eye movements and manual responses. It was found that saccade latencies were less dependent on flash intensity than were manual responses. In addition, detection failures to near-threshold flashes were significantly less frequent when subjects signaled detection of the flash by making a saccade. These differences in detection performance may reflect a greater capacity of the oculomotor system to decode near-threshold ganglion cell responses.
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