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Conscious Intention and Motor Cognition 2010.08.04 Seung-hyun Lee Soft Computing Lab. Patrick Haggard, Trends in Cognitive Sciences Vol. 9, No. 6, pp.

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Presentation on theme: "Conscious Intention and Motor Cognition 2010.08.04 Seung-hyun Lee Soft Computing Lab. Patrick Haggard, Trends in Cognitive Sciences Vol. 9, No. 6, pp."— Presentation transcript:

1 Conscious Intention and Motor Cognition Seung-hyun Lee Soft Computing Lab. Patrick Haggard, Trends in Cognitive Sciences Vol. 9, No. 6, pp. 290~295,2005

2 S FT YONSEI UNIV. KOREA 16 Contents Introduction Thought on intention: Past vs Present Libet’s experiment Action –Generation –Selection –Urge & effect –Linking urge to effect Conclusion 1

3 S FT YONSEI UNIV. KOREA 16 Introduction 2 Q) What is left over if I subtract the fact that my arm goes up from the fact that I raise my arm?’ A) Intention to move one’s arm - prior intention - intention in action

4 S FT YONSEI UNIV. KOREA 16 Thoughts on intention A computational framework for action 3 Past

5 S FT YONSEI UNIV. KOREA 16 Thoughts on intention(cont’d) Prevalent idea for action: Decartes 4 MindActionBody Past

6 S FT YONSEI UNIV. KOREA 16 Thoughts on intention(cont’d) Conscious experiences = consequences of brain activity Why? –No direct nor strong tools for studying intention –Evasive conscious experience of intending : lack of vivid quality of visual phenomena –Changes in dominant view : action as conditioned responses to environmental stimuli 5 Present

7 S FT YONSEI UNIV. KOREA 16 Libet’s Experiment Setup 6

8 S FT YONSEI UNIV. KOREA 16 Libet’s Experiment(Cont’d) Result 7  Conscious intention is not the cause of action

9 S FT YONSEI UNIV. KOREA 16 Libet’s Experiment(Cont’d) Possibilities –Conscious intention could be part of an illusion of mental causation, retrospectively inferred to explain behavior –Conscious intention could be an immediate consequence of the brain processes which prepare action 8

10 S FT YONSEI UNIV. KOREA 16 Libet’s Experiment(Cont’d) Supporting experiments –Lau et al. Used fMRI Judging action vs judging intention Greater activation on pre-supplementary motor area & intra-parietal sulcus for judging intentions –Sirigu et al. Patients with focal cerebellar or parietal lesions Parietal group showed delay in the awareness of conscious intention 9 Preparatory activity in the motor areas Action Conscious intention

11 S FT YONSEI UNIV. KOREA 16 Action Generation Features –Goal-directed. Intention through to the intended effect == Ideomotor –Involving a pervasive process of information expansion Two aspects of will –Internal generation Ex) reflexes –Selection or choice between alternative possible actions 10

12 S FT YONSEI UNIV. KOREA 16 Action Selection Haggard and Eimer’ s study –Two subject groups: showing early and late judgement of intention –Readiness potential  W judgement (X) –Lateralised readiness potential  W judgement (O)  Conscious intention is linked to the specific preparation to perform a particular movements 11 Selection process Motor command Conscious intention

13 S FT YONSEI UNIV. KOREA 16 Action Selection(cont’d) Studies –Ammon & Gandevia : Transcranial Magnetic Stimulation(TMS)  no awareness of altered responding –Brasil-Neto et al. –: TMS go signal  later responses were unaffected 12 Selection process Unconscious process

14 S FT YONSEI UNIV. KOREA 16 Conscious Intention 13 UrgeEffect(Agency) Definitionbeing about to move prediction of the goal sta te Neuronmotoricsensory Focusinternalexternal Corresponding theory Libet's W judgement Jame's ideomotor theory of action Urge & Agency

15 S FT YONSEI UNIV. KOREA 16 Conscious Intention(Cont’d) Fried et al.’s experiment –Stimulations of the cerebral cortex via electronodes Result –Feeling of an urge to move a specific body part during the low intensity stimulation –Real movement under higher stimulation  conscious intentions are at least partly preconstructions rather than reconstructions 14 Urge

16 S FT YONSEI UNIV. KOREA 16 Conscious Intention(Cont’d) Reflexive feeling that ‘I’ control events in the outside world Agency as an illusion of mental causation –Post-hoc reconstruction of agency –People can incorrectly infer agency based on repeated associations between events which are in fact unrelated –An experiment by Wegner and Weatley 15 Sense of Agency Experience that I cause the event

17 S FT YONSEI UNIV. KOREA 16 Conscious Intention(Cont’d) Anarchic Hand Syndrome(AHS) by Marcel –Patients with frontal lobe and callosal damage Perform well-formed actions in response to environmental cues But actions are contrary to the patient’s will, and occur without preceding conscious intention –Della Sala et al’s supporting example Two sources of actions –Ownership of action - agency –Ownership of the source of action - urge 16 Sense of Agency

18 S FT YONSEI UNIV. KOREA 16 Conscious Intention(Cont’d) Haggard et al. –Experiment: Indicate time of action and effect –Result 17 Linking Urge to Agency

19 S FT YONSEI UNIV. KOREA 16 Conclusion It seems extremely HARD to apply in agent system Studies on imitation –People typically imitate other’s goal –Not the movements they use to achieve them –Bekkering, H. et al., “Imitation of gestures in children is goal directed,” Q. J. Exp. Psychol. A 53, 153–164, 2000 Additional reference(decision making) –A. Dijksterhuis, et al., “On Making the Right Choice: The Deliberation-Without- Attention Effect,” Science, vol. 311, no. 5763, pp

20 Thank you


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