Effect of benzedrine sulphate on blocking in color naming.

Abstract

The data of this investigation warrant the following conclusions: "(1) Fifteen m.g. of benzedrine sulphate has no effect on (a) number of blocks occurring in color naming, (b) length of blocks, (c) location of blocks within trials, (d) influence of fatigue on length of blocks, and (e) influence of fatigue on speed of response. (2) Fifteen m.g. of benzedrine sulphate slightly increases speed of response in color naming. (3) Most of the variation in blocking and speed of response is due to individual differences."

A study of discriminative serial action: manual response to color.

“…The present experiment aims to investigate further some of the questions raised by the work of Bills and of others. Specifically, the problems to be investigated are: (1) the existence of sex differences, differences between the freshman and senior college classes, and individual differences in discriminative serial action measures of speed, accuracy, and variability; (2) the changes in magnitude of measures during the course of performance; (3) the effect of a retest 177 on performance measures; (4) the relationships among performance measures. Special emphasis is placed on the phenomenon of the occurrence of long response times ('mental blocks').…”