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  • Title: Heart rate and reaction times for mentally retarded and nonretarded adults in subject- and experimenter-initiated tasks.
    Author: Gardepe JP, Runcie D.
    Journal: Am J Ment Defic; 1983 Nov; 88(3):314-20. PubMed ID: 6650583.
    Abstract:
    Reaction time (RT) and heart-rate measures were obtained for 10 retarded (mean IQ = 65) and 10 nonretarded young adults. Each subject initiated half of the trials themselves. The other half were initiated by the experimenter. These trials were distributed over preparatory intervals of 2-, 4-, and 8-second durations. We found that all subjects, when initiating the trial themselves, reduced both mean RT and response variability. Heart-rate patterns were similar for both intelligence groups on experimenter-initiated trials, but were markedly different when subjects initiated the trials themselves. Results suggest that self-initiated trials may benefit retarded subjects by overcoming some attentional problems, but difficulties with utilizing successful response strategies remain.
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