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Biomedical subjects

A R Blackman

Publications and source records attributed to A R Blackman.

3 recordsLinked to original sources
PubMed1990

The effect of apparent movement on mental rotation.

Eleven subjects were timed as they judged whether a small bar perpendicular to one side of a clockhand would point left or right if the hand was pointing upward (i.e., at the "12 o'clock" position). The clockhand was shown in two successive orientations 30 degrees apart, so that it was perceived to jump from one to the other in either a clockwise or a counterclockwise direction. Reaction times were consistent with the interpretation that the subjects "mentally rotated" the clockhand from its perceived orientation back to the upright before making their decisions. The direction of the jump influenced perceived orientation but did not influence either the direction or rate of mental rotation itself.

Adult↗
PubMed1980

Relative frequency effect on choice reaction time.

Subjects gave either vocal (position-naming) or manual (button-press) responses to spatially arrayed lights in a four-alternative choice reaction task. Relative stimulus frequency, stimulus discriminability, and S-R compatibility were each shown to be significant determinants of RT. The effects of discriminability and compatibility on the mean and variance of RT were additive. A significant interaction of frequency X discriminability was taken as evidence that a component of the relative frequency effect arises at the stimulus encoding stage. A second component of the relative frequency effect, presumed to occur at the S-R translation stage, was indicated by a significant interaction of frequency X compatibility. It was proposed that recall of the S-R translation rule takes longer for less frequent stimuli and that this difference increases when S-R pairings are not compatible.

Adult↗