Masking efficiency as a function of stimulus onset asynchrony for spatial-frequency detection and identification.
Detection and identification thresholds for grating targets were measured in the presence of a compound mask grating as a function of the stimulus onset asynchrony (SOA). The detection and identification SOA functions are both reversed U-shaped but they are not parallel. The detection-to-identification ratio is itself a reversed U-shaped function of SOA, even for stimuli two octaves apart, with a peak between +20 and +60 ms SOA (backward masking). It is argued that these results support the hypothesis according to which detection and identification are serial processes.
Gorea
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Laboratoire de Psychologie Expérimentale, Université René Descartes, CNRS, Paris, France.
D005556:Form Perception / Q000502:physiology; D006801:Humans; D012684:Sensory Thresholds; D014796:Visual Perception / Q000502:physiology*