David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Jack Alan Reynolds
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Consciousness and Cognition 11 (2):231-40 (2002)
Trevena and Miller provide further evidence that readiness potentials occur in the brain prior to the time that participants claim to have initiated a voluntary movement, a contention originally forwarded by Libet, Gleason, Wright, and Pearl . In their examination of this issue, though, aspects of their data lead them to question whether their measurement of the initiation of a voluntary movement was accurate. The current article addresses this concern by providing a direct analysis of biases in this task. This was done by asking participants to make subjective timing decisions regarding a stimulus that could be measured objectively. Our findings suggest that their timing task was indeed biased such that participants' tend to report events as happening approximately 70 ms later than they actually happened. Implications for the original Libet et al. claims are discussed
|Keywords||*Consciousness States *Data Collection *Perception *Physiological Correlates *Time Series Response Bias Time Perception|
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References found in this work BETA
Benjamin W. Libet (1985). Unconscious Cerebral Initiative and the Role of Conscious Will in Voluntary Action. Behavioral and Brain Sciences 8 (4):529-66.
Daniel M. Wegner & T. Wheatley (1999). Apparent Mental Causation: Sources of the Experience of Will. American Psychologist 54:480-492.
Benjamin Libet, C. Gleason, E. Wright & D. Pearl (1983). Time of Conscious Intention to Act in Relation to Onset of Cerebral Activity (Readiness-Potential). The Unconscious Initiation of a Freely Voluntary Act. Brain 106:623--664.
Benjamin W. Libet (1981). The Experimental Evidence for Subjective Referral of a Sensory Experience Backwards in Time: Reply to P.S. Churchland. Philosophy of Science 48 (June):182-197.
Gilberto Gomes (1998). The Timing of Conscious Experience: A Critical Review and Reinterpretation of Libet's Research. Consciousness and Cognition 7 (4):559-595.
Citations of this work BETA
Daniel Bratzke, Donna Bryce & Tanja Seifried-Dübon (2014). Distorted Subjective Reports of Stimulus Onsets Under Dual-Task Conditions: Delayed Conscious Perception or Estimation Bias? Consciousness and Cognition 30:36-47.
Markus E. Schlosser (2014). The Neuroscientific Study of Free Will: A Diagnosis of the Controversy. Synthese 191 (2):245-262.
Jeff Miller, Paula Vieweg, Nicolas Kruize & Belinda McLea (2010). Subjective Reports of Stimulus, Response, and Decision Times in Speeded Tasks: How Accurate Are Decision Time Reports? Consciousness and Cognition 19 (4):1013-1036.
S. Pockett & A. Miller (2007). The Rotating Spot Method of Timing Subjective Events. Consciousness and Cognition 16 (2):241-254.
Jeff Miller & Wolf Schwarz (2014). Brain Signals Do Not Demonstrate Unconscious Decision Making: An Interpretation Based on Graded Conscious Awareness. Consciousness and Cognition 24 (1):12-21.
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