نقد و بررسی آزمایش‌های لیبت

نوع مقاله : مقاله پژوهشی

نویسنده
گروه آموزشی فلسفه دانشکده ادبیات دانشگاه خوارزمی
چکیده
آزمایش‌های لبیت –علی‌الادعا- نشان می‌دهند که فرآیندهای ناآگاهانه مغزی، قبل از آنکه از آنها باخبر شویم، تصمیم‌های ما را شکل می‌دهند. برخی بر اساس این مطالعات تجربی مدّعی شده‌اند که ما فاقد اراده آزاد هستیم. در این مقاله سه پاسخ به این مدّعا ارائه شده است: نخست، بسیار محل تردید است که افعال مورد مطالعه در آزمایش‌های لیبت نمونۀ کاملِ‌ افعالی باشند که آزاد شمرده می‌شوند. چنین افعالی در بهترین حالت نمونه‌های نازلی از افعال آزاد بشمار می‌آیند. دوم اینکه، لیبت مفاهیمی مثل "میل" و "قصد" را جابجا بکار می‌برد درحالی‌که تفسیری جایگزین از داده‌های لیبت می‌گوید آنچه شرکت‌کنندگان از خود گزارش می‌کنند تنها میل به حرکت است و نه قصد یا تصمیم به حرکت. و سوم اینکه، نتایج لیبت تهدیدی مستقل بر ضد ارادۀ آزاد بشمار نمی‌آیند بلکه صرفا تکرار این مدّعا هستند که تعیّن‌گرایی با آزادی جمع-شدنی نیست. از این جهت، این آزمایش‌ها نمی‌توانند دلیلی بر ضدّ همسازگرایی به شمار ‌آیند.
کلیدواژه‌ها

عنوان مقاله English

A critical discussion of Libet’s Experiments

نویسنده English

Bahram Alizade
Department of Philosophy Kharazmi University
چکیده English

Abstract
Libet’s experiments, showing that we become aware of our intention to act only after we have unconsciously formed it. Based on these experimental studies, Some claim that we do not possess free will. This paper offers three responses to this claim; First, it is doubtful that actions studied in the Libet’s experiments are ideal exemplars of free will. They are at best ‘degenerate’ examples of free will. Second, Libet uses such terms as ‘urge’ and ‘intention’ interchangeably. An alternative interpretation of Libet’s results says, what the subjects were required to report was not a conscious intention or decision to act, but rather a perceived urge to move. Third, Libet’s results do not constitute a separate challenge to our freedom. It is merely rehearsing the claim that determinism is incompatible with free will. So, Libet’s experiments provide no evidence against compatibilist notion of free will.
Keywords: Libet’s experiments, Free will, Readiness potential, Conscious decision, Compatibilism.

کلیدواژه‌ها English

Libet’s experiments
Free will
Readiness potential
Conscious decision
Compatibilism
§  Armstrong and L. Nadel (eds.) Conscious Will and Responsibility. New York: Oxford.
§  Banks, W. P. & Pockett, S. 2007. Benjamin Libet's work on the neuroscience of free will. In M. Velmans & S. Schneider (eds.), The Blackwell Companion to Consciousness. Blackwell.
§  Bayne, Tim (2011) “Libet and the Case for Free Will Scepticism”, in: Swinburne, Richard, editor(s). Free Will and Modern Science, Oxford: Oxford University Press, pp. 25-46.
§  Dennett, D., and Kinsbourne, M. 1992. Time and the observer: The where and when of consciousness in the brain. Behavioral and Brain Sciences 15: 183–247
§  Flanagan, O. 1996. Neuroscience, agency, and the meaning of life. In Self-Expressions.
§  Frankfurt, Harry G. “Alternate Possibilities and Moral Responsibility,” Journal of Philosophy 66, 829–39.
§  Haggard, P. and Eimer, M. (1999). On the relation between brain potentials and conscious awareness. Experimental Brain Research, 126: 128133.
§  Haggard, P., & Magno, E. (1999). Localising awareness of action with transcranial magnetic stimulation. Experimental Brain Research, 127, 102–07.
§  Hallett, M. (2007). Volitional control of movement: The physiology of free will. Clinical Neurophysiology, 118, 1179–92.
§  Herrmann, C. S., Pauen, M., Min, B. K., Busch, N. A., & Rieger, J. W. (2008). Analysis of a choice reaction task yields a new interpretation of Libet's experiments. International Journal of Psychophysiology, 67(2), 151-157.
§  James, W. (1981), The Principles of Psychology (Cambridge, MA: Harvard University Press).
§  Kane, Robert, 1996. The Significance of Free Will. Oxford: Oxford University Press.
§  Klein, S. (2002). Libet’s timing of mental events: Commentary on the commentaries. Consciousness and Cognition, 11, 326–333.
§  Kornhuber, H. H., & Deecke, L. (1965). Hirnpotential¨anderungen bei Willk¨urbewegungen und passiven Bewegungen des Menschen: Bereitschaftspotential und reafferente Potentiale. Pflüger’s Archiv für die gesamte Physiologie des Menschen und der Tiere, 284(1), 1-17.
§  Levy, N. & Bayne, T. 2004. Doing without deliberation: automatism, automaticity, and moral accountability, International Review of Psychiatry, 16/4: 209-15.
§  Libet, B. (1985). Unconscious cerebral initiative and the role of conscious will in voluntary action. The Behavioral and Brain Sciences, 8, 529–66.
§  Libet, B. (1992). The neural time-factor in perception, volition and free will. Revue de Me´taphysique et de Morale, 2, 255–72.
§  Libet, B., Gleason, C.A., Wright, E.W. & Pearl, D. 1983. Time of unconscious intention to act in relation to onset of cerebral activity (Readiness-Potential), Brain, 106: 623-42.
§  Mele, A. R. 2009. Effective Intentions: The Power of conscious will, New York/ Oxford: Oxford University Press.
§  Mele, A. 2013. "Free Will and Neuroscience: Revisiting Libet's Studies," in A. Suarez and P. Adams, eds. Is Science Compatible with Free Will? Springer (2013): 195-207.
§  Nahmias, E. (2014). Is free will an illusion? Confronting challenges from the modern mind sciences. In W. Sinnott-Armstrong (2014), pp. 1–25.
§  Nahmias, E., Morris, S.G., Nadelhoffer, T., & Turner, J. 2005. Surveying freedom: Folk intuitions about free will and responsibility, Philosophical Psychology, 18/5: 561-84.
§  Nichols, S. 2006. Folk intuitions on free will. Journal of Cognition and Culture, 6/1-2:57-85.
§  Nichols, S., & Stich, S. 2003. Mindreading. Oxford: Oxford University Press.
§  Pockett, S. (2006). The neuroscience of movement. In S. Pockett, W. Banks, & S. Gallagher (Eds.), Does consciousness cause behavior? An investigation of the nature of volition. Cambridge, MA: MIT Press.
§  Roland, P.E., Larsen, B., Lassen, N.A. &Skinhoj, E. ‘Supplementary motor area and other cortical areas in organization of voluntary movements in man’, Journal of Neurophysiology (1980) 43: 118-136.
§  Roskies, A. 2011. Why Libet’s studies don’t pose a threat to free will. In W. Sinnott- Armstrong and L. Nadel (eds.) Conscious Will and Responsibility. New York: Oxford University Press, pp. 11-22.
§  Searle, J. (2001), Rationality in Action (Cambridge, MA: MIT Press).
§  Soon, C. S., Brass, M., Heinze, H. J., & Haynes, J. D. (2008). Unconscious determinants of free decisions in the human brain. Nature Neuroscience, 11, 543–545.
§  Wegner, D. (2002). The illusion of conscious will. Cambridge, MA: MIT Press.