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Psychophysical performance. Behavioral data are plotted as the fraction of trials in which the monkey released the lever as a function of TNR during target-in-noise trials (i.e., hit rate; A) and as a function of d′ (B). d′ was calculated from the hit rate and from the proportion of false-alarm trials during the noise-only trials. Error bars are SD calculated using behavioral data from all of the recording sessions reported in this study.
