The psyche in psychophysics: A sensory-decision theory analysis of the effect of instructions on flicker sensitivity and response bias.

Instruction-induced changes in flicker thresholds, measured by traditional psychophysical procedures, may reflect changes in sensory sensitivity or in response bias. In 16 psychiatric patients, a facilitating set, in contrast to an inhibiting set, increased the proportion of flicker responses to both a physically intermittent light ("hits," p