Gruffydd R Humphreys

Cardiff University, Cardiff, WLS, United Kingdom

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Publications (4)14.14 Total impact

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    Gruffydd R Humphreys, Marc J Buehner
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    ABSTRACT: We report two experiments demonstrating temporal binding between action and outcome (Haggard et al. 2002a) as measured in a temporal reproduction paradigm. Our results show that the effect is empirically robust, does not rely on repeated presentation of fixed intervals, truly affects time perception, and persists across intervals much longer than in earlier demonstrations with the Libet Clock paradigm (Libet et al. 1983).
    Experimental Brain Research 06/2010; 203(2):465-70. DOI:10.1007/s00221-010-2199-1 · 2.17 Impact Factor
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    Marc J Buehner, Gruffydd R Humphreys
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    ABSTRACT: Causality is a higher-level mental construct derived from low-level percepts such as contiguity in space-time. We show that low-level spatial perception is distorted by the presence of a causal connection, such that two objects appear closer in space when they are causally linked than when they are not. This finding parallels recent demonstrations of temporal causal binding and suggests that causality is at the root of a general ambiguity-resolution process operating on the human perceptual system.
    Psychological Science 01/2010; 21(1):44-8. DOI:10.1177/0956797609354735 · 4.43 Impact Factor
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    Gruffydd R Humphreys, Marc J Buehner
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    ABSTRACT: Several recent studies (e.g., Haggard, Aschersleben, Gehrke, & Prinz, 2002; Haggard & Clark, 2003; Haggard, Clark, & Kalogeras, 2002) have demonstrated a "Temporal Binding" effect in which the interval between an intentional action and its consequent outcome is subjectively shorter compared to equivalent intervals that do not involve intentional action. The bulk of the literature has relied on the "Libet Clock" (Libet, Gleason, Wright, & Pearl, 1983; but see also Engbert & Wohlschläger, 2007; Engbert, Wohlschläger, Thomas, & Haggard, 2007; Engbert, Wohlschläger, & Haggard, 2008). Here we demonstrate that Temporal Binding is a robust finding that can also be reliably achieved with a Magnitude Estimation procedure, and that occurs over intervals far greater than those previously explored. Implications for the underlying mechanisms are discussed.
    Journal of Experimental Psychology Human Perception & Performance 10/2009; 35(5):1542-9. DOI:10.1037/a0014492 · 3.11 Impact Factor
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    Marc J Buehner, Gruffydd R Humphreys
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    ABSTRACT: According to widely held views in cognitive science harking back to David Hume, causality cannot be perceived directly, but instead is inferred from patterns of sensory experience, and the quality of these inferences is determined by perceivable quantities such as contingency and contiguity. We report results that suggest a reversal of Hume's conjecture: People's sense of time is warped by the experience of causality. In a stimulus-anticipation task, participants' response behavior reflected a shortened experience of time in the case of target stimuli participants themselves had generated, relative to equidistant, equally predictable stimuli they had not caused. These findings suggest that causality in the mind leads to temporal binding of cause and effect, and extend and generalize beyond earlier claims of intentional binding between action and outcome.
    Psychological Science 10/2009; 20(10):1221-8. DOI:10.1111/j.1467-9280.2009.02435.x · 4.43 Impact Factor

Publication Stats

132 Citations
14.14 Total Impact Points

Institutions

  • 2009–2010
    • Cardiff University
      • School of Psychology
      Cardiff, WLS, United Kingdom
    • University of South Wales
      Понтиприте, Wales, United Kingdom