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UID:20251227T131137EST-61566OON5i@132.216.98.100
DTSTAMP:20251227T181137Z
DESCRIPTION:\n\n\n  Dario G Liebermann\,\nPhD\nDepartment of Physical Thera
 py\, Sackler Faculty of Medicine\,\nUniversity of Tel Aviv - Israel\n\n\n
 \n Human movements may express\ndifferent internal states\; e.g.\, removin
 g the arm from a noxious\nsource on the table looks different than intenti
 onally flexing the\narm to lift an object even though similar muscles may 
 be activated.\nThe identification of the internal states that drive such\n
 fundamentally different movements is facilitated by the recognition\nof in
 variant kinematic features (i.e.\, observable features that\nremain consta
 nt in spite of changes in load\, direction and speed of\nmovement or other
  factors). In the present study\, it is argued that\nkinematic invariants 
 express also higher-level motor solutions. For\nthis purpose\, spinal and 
 supraspinal processes were simultaneously\nelicited (reflexive and volunta
 ry motor responses\, respectively).\nThe two processes were described in t
 erms of the temporal evolution\nof the 3D hand paths (i.e.\, the tangentia
 l velocity profiles). A\n'vector superposition scheme' (Henis & Flash 1995
 ) was\nhypothesized where reflex and voluntary movements integrated in\nor
 der to produce  a global coherent response. Preliminary data\nshowed that 
 two different motor actions may combine in more than\none way. Under the s
 ame conditions\, sometimes they 'cooperate'\nfollowing the hypothesized su
 persposition scheme and sometimes they\n'compete' whereas the reflex pertu
 rbs the voluntary response.\nTheoretical and practical implications of thi
 s preliminary research\nare opened for discussion. \n\n
DTSTART:20100216T210000Z
DTEND:20100216T220000Z
LOCATION:Davis House\, CA\, QC\, Montreal\, H3G 1Y5\, 3654 promenade Sir Wi
 lliam Osler
SUMMARY:Research Seminars - Dario G Liebermann: Kinematic coupling of withd
 rawal reflexes and voluntary motion: cooperative versus competitive scheme
 s
URL:/channels/event/research-seminars-dario-g-lieberma
 nn-kinematic-coupling-withdrawal-reflexes-and-voluntary-motion-coo-114634
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