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The purpose of this study was to test the hypothesis that intensity and organization of muscular activity is a function of S's expectation of a task's duration. The electrical activity of the following muscles was measured while S was holding a 19-lb. weight under expectation for short and long tasks: biceps brachii, brachioradials, brachialis, and flexor carpi ulnaris. For the intervals measured, there was less electrical activity in all muscles during the long task. The less appropriatedoi:10.1037/h0031811 fatcat:2o227rz4mfbn3lwb7zbkgd3ffy