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Temporal integration characteristics in spatial frequency identification

Measured spatial frequency detection and identification performances simultaneously as a function of exposure duration in 3 observers with normal or corrected vision. Detection and identification sensitivity/duration functions were parallel over durations ranging from 10 to 1,000 msec, independent of both spatial frequency and spatial frequency difference between the stimuli to be discriminated. Results are compatible with both a simultaneous or a serial processing of the 2 types of tasks. In the former case, detection and identification would take place at the same neural level and therefore would be indistinguishable. The 2nd alternative implies that the identification stage must have a time constant substantially shorter than the detection stage. Both possibilities are compatible with the concept of spatial-frequency-labelled detectors. (22 ref) (PsycINFO Database Record (c) 2005 APA, all rights reserved)



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