Sensory-motor equivalence: manual aiming in C6 tetraplegics following musculotendinous transfer surgery at the elbow.
Cervical spinal lesions at C6 result in paralysis of the triceps brachii while leaving deltoid and elbow flexor function intact. We examined the spatial-temporal characteristics of goal-directed aiming movements performed by C6 tetraplegics who had undergone musculotendinous transfer surgery in which the posterior deltoid replaces the triceps as the elbow extensor. On some trials, liquid crystal goggles were used to eliminate vision of the limb and target upon movement initiation. Although tetraplegic participants achieved the same degree of movement accuracy/consistency as control participants, their movement times were longer regardless of whether the movements were made away from (elbow extension) or towards the body (elbow flexion). Longer movement times were related to lower peak velocities, and not the symmetry of the aiming profiles. The tetraplegic participants were no more dependent on visual feedback for limb regulation than control participants. Although the characteristics of the movement trajectories were surprisingly similar, in both vision conditions, tetraplegics required more real and proportional time to reduce spatial variability in the limb's trajectory for elbow extensions. Our results indicate that the sensorimotor system is adaptable and that the representations governing limb control are not muscle specific.
Robinson
Mark A
MA
Research Institute for Sport and Exercise Sciences, Faculty of Science, Liverpool John Moores University, Tom Reilly Building, Byrom Street, L3 3AF, Liverpool, UK.
Hayes
Spencer J
SJ
Bennett
Simon J
SJ
Barton
Gabor J
GJ
Elliott
Digby
D
D000328:Adult; D001696:Biomechanical Phenomena; D016022:Case-Control Studies; D002574:Cervical Vertebrae / Q000293:injuries* / Q000473:pathology; D004550:Elbow / Q000503:physiopathology / Q000601:surgery*; D025461:Feedback, Physiological; D006801:Humans; D008875:Middle Aged; D009068:Movement / Q000502:physiology*; D011782:Quadriplegia / Q000503:physiopathology / Q000601:surgery*; D011930:Reaction Time / Q000502:physiology; D013997:Time Factors; D014163:Transfer, Psychology / Q000502:physiology*; D014785:Vision, Ocular / Q000502:physiology
Q J Exp Psychol A. 1985 Aug;37(3):407-25
4048546
Hum Mov Sci. 2008 Dec;27(6):839-56
18768232
Spinal Cord. 2000 Jun;38(6):354-62
10889564
J Mot Behav. 2007 May;39(3):169-77
17550869
Spinal Cord. 2007 Jul;45(7):502-12
17325696
IEEE Trans Rehabil Eng. 1996 Dec;4(4):403-9
8973966
Exp Brain Res. 2005 Sep;166(1):1-16
16132966
J Hand Surg Am. 2001 Jan;26(1):147-55
11172382
Spinal Cord. 2003 Aug;41(8):435-45
12883541
Can J Exp Psychol. 2006 Sep;60(3):200-8
17076435
Hum Mov Sci. 2007 Dec;26(6):892-912
17937969
Trends Cogn Sci. 2000 Nov 1;4(11):423-431
11058820
Psychol Bull. 2001 May;127(3):342-57
11393300
Neuroscience. 2006 May 12;139(2):749-65
16448777
J Neurophysiol. 1996 Jun;75(6):2533-41
8793762
Neurosci Biobehav Rev. 2006;30(8):1106-21
16839604
Behav Res Methods. 2010 Nov;42(4):1087-95
21139176
Spinal Cord. 2010 Aug;48(8):619-27
20065989
Psychol Rev. 1979 Sep;47(5):415-51
504536
Psychol Rev. 1988 Jul;95(3):340-70
3406245
J Mot Behav. 2003 Mar;35(1):33-40
12724097
Exp Brain Res. 2003 Jan;148(1):62-76
12478397
Res Q Exerc Sport. 2005 Mar;76(1):60-6
15810771
Nature. 1998 Apr 23;392(6678):814-8
9572140
Exp Brain Res. 1992;91(3):509-19
1483523
Sci Am. 1972 May;226(5):30-7
4260739
Ergonomics. 2009 Apr;52(4):438-47
19401895
Res Q Exerc Sport. 1993 Dec;64(4):404-12
8278666
Exp Brain Res. 2006 Apr;170(4):543-54
16307261
J Mot Behav. 2002 Sep;34(3):253-70
19260176
Motor Control. 2000 Apr;4(2):165-84
11500574
Neuroimage. 2010 Feb 1;49(3):2570-80
19874897