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Individual differences in right and left reaction time.

M Annett, J Annett

    British Journal of Psychology (London, England : 1953)
    |August 1, 1979
    PubMed
    Summary
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    Individual differences in reaction time were observed, with most people responding faster to left-sided stimuli. Handedness and sex did not impact these reaction time variations.

    Area of Science:

    • Cognitive Psychology
    • Human Factors Engineering
    • Neuroscience

    Background:

    • Reaction time (RT) studies often investigate factors like stimulus presentation and motor responses.
    • Understanding individual differences in RT is crucial for fields ranging from psychology to ergonomics.
    • Previous research has explored handedness effects, but stimulus laterality's role is less understood.

    Purpose of the Study:

    • To investigate the influence of stimulus laterality on simple and two-choice reaction times.
    • To examine how hand and finger choice affects reaction time.
    • To determine if handedness, sex, or stimulus side influences reaction speed.

    Main Methods:

    • Participants performed simple and two-choice reaction time tasks.
    • Stimuli were presented to the left or right visual field.

    Related Experiment Videos

  • Responses were recorded using different fingers and hands, noting hand preference and sex.

    • Main Results:

    • Significant individual differences emerged, with most participants showing faster RT to left-sided stimuli.
    • A notable minority responded faster to right-sided stimuli.
    • The right index finger exhibited slower responses compared to the left index or middle fingers.
    • Inter-hand choices were faster than intra-hand choices, with left-hand intra-hand choices being faster than right-hand ones.
    • No significant effects of hand preference or sex were found.

    Conclusions:

    • Stimulus laterality is a significant factor influencing simple and choice reaction times, independent of handedness or sex.
    • Specific finger and hand combinations yield differential reaction speeds.
    • These findings highlight the complex interplay between sensory input, motor output, and individual variability in reaction time tasks.