The latency operating characteristic: II. Effects of visual stimulus intensity on choice reaction time.

1972 ◽  
Vol 93 (2) ◽  
pp. 367-372 ◽  
Author(s):  
Joseph S. Lappin ◽  
Kenneth Disch
Keyword(s):  
Reaction Time ◽  
Stimulus Intensity ◽  
Choice Reaction Time ◽  
Visual Stimulus ◽  
Operating Characteristic

The Effect of Auditory Stimulus Intensity on the Reaction Time of Schizophrenics

1958 ◽  
Vol 104 (437) ◽  
pp. 1160-1164 ◽  
Author(s):  
P. H. Venables ◽  
J. Tizard
Keyword(s):  
Reaction Time ◽  
Auditory Stimulus ◽  
Stimulus Intensity ◽  
Visual Stimulus ◽  
Visual Stimuli ◽  
Normal Subjects ◽  
Optimum Point ◽  
Paradoxical Phenomenon ◽  
The Mean

Two earlier studies (Venables and Tizard, 1956a, b) on the reaction time (RT) of schizophrenics have shown that as the intensity of a visual stimulus is increased beyond an optimum point, RT to the stimulus increases. This “paradoxical” increase in RT is not shown by normal subjects, whose RT decreases as the intensity of visual stimulus increases. It was also found that the paradoxical phenomenon with visual stimuli was only shown on an initial occasion of testing. When the experiment was repeated twenty-four hours later, although there was no alteration in the mean level of RT, the pattern of increase in RT with increasing intensity, previously found, was absent.

Analysis of Task Difficulty under Varying Conditions of Induced Stress

1970 ◽  
Vol 31 (2) ◽  
pp. 343-348 ◽  
Author(s):  
Jerry W. Thornton ◽  
Paul D. Jacobs
Keyword(s):  
Reaction Time ◽  
Choice Reaction Time ◽  
Reaction Time Task ◽  
Simple Reaction Time Task ◽  
Simple Task ◽  
Practical Applications ◽  
Time Task ◽  
Significant Difference ◽  
Task Relatedness ◽  
Related Stress

Two tasks (simple and choice reaction time) were examined while varying three types of stressors (shock, threat of shock, and noise) and the stressor task relationship (i.e., task-related stress, task-unrelated stress, and no-stress). Four specific hypotheses were tested and 3 were supported in the simple reaction-time task. There were no significant differences among stressors for either task, although greater differences were reported in the simple than in the choice reaction-time task. A significant difference between the “task-relatedness” of stress levels in the simple task was interpreted as possibly due to a “coping” or “protective adaptive mechanism” in which increases in performance serve to reduce stress. Practical applications were examined.

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