Abstract
3 experiments were conducted in which 9 Ss were required to construct a random-appearing series by pronouncing five items (numerals, letters, or nonsense syllables), with his self-pacing or the fastest pace possible. Main findings were: 1) In most of the subjective random-series (SRS), the probability with which an item was used, was approximately uniform for the five items. 2) Repetition of same items occurred much less frequently than the expectation by chance. 3) The direct after-effect of a response or its indirect consequence remained after five responses. 4) Some effects of ordinal structure of items seemed to exist. 5) The SRS approached the objective random-series when S was stressed by the fast pace of responding.

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