Abstract
11 male and 11 female college students at California State College, Los Angeles were tested for brightness constancy perception while experiencing induced muscular tension (IMT). One-half S's maximum grip on a standard hand dynomometer was used for induced muscular tension. IMT was expected to increase activation and attention, and facilitate veridicality of perception in the brightness constancy situation. A repeated measures design was used; each S ran through the constancy test twice, once with IMT, once without. A difference score was calculated for each S by substracting the scores obtained with IMT from those obtained without. The t test (p < .05; t = 2.23) was in the opposite direction from the predicted. IMT heightened activation, but the outcome was facilitation of brightness constancy, not veridicality.