Does Parkinson's disease affect judgement about another person's action?
The observer's motor system has been shown to be involved in observing the actions of another person. Recent findings suggest that people with Parkinson's disease do not show the same motor facilitatory effects when observing the actions of another person. We studied whether Parkinson's patients were able to make unspeeded judgements about another person's action. Participants were asked to watch video clips of an actor lifting a box containing different weights (100, 200, 300 or 400 g) and to guess the weight that was being lifted on a 9-point scale. We compared the performance of 16 patients with PD with 16 healthy age-matched controls. Both groups were able to do the task, showing a significant relationship between the real weight and the guessed weight, albeit with a tendency to overestimate the lowest weight and underestimate the heaviest weight. The PD patients, however, showed a reduced slope value. These results show that despite their own motor deficits, PD patients are still able to judge the weight being lifted by another person, albeit with a slight reduction in accuracy. Further research will be required to determine whether PD patients use a motor simulation or a visual compensatory strategy to achieve this.
Poliakoff
E
E
School of Psychological Sciences, University of Manchester, Manchester, M13 9PL, UK. ellen@poliakoff.org.uk
Galpin
A J
AJ
Dick
J P R
JP
Tipper
S P
SP
D000368:Aged; D000704:Analysis of Variance; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007600:Judgment; D008297:Male; D008875:Middle Aged; D009039:Motion Perception; D009043:Motor Activity; D010300:Parkinson Disease / Q000523:psychology*; D011601:Psychophysics; D012938:Social Perception; D014741:Video Recording
Mov Disord. 2002 Nov;17(6):1148-60
12465051
Neuroimage. 2006 Jan 15;29(2):524-35
16112877
Neuroreport. 2007 Mar 26;18(5):483-7
17496808
Curr Biol. 2004 Mar 23;14(6):493-8
15043814
J Psychiatr Res. 1982-1983;17(1):37-49
7183759
Neuropsychologia. 2007 Jun 11;45(10):2201-15
17448507
Hum Mov Sci. 2007 Apr;26(2):203-11
17343949
Neuropsychologia. 1995 Jun;33(6):727-41
7675164
J Clin Neuropsychol. 1983 Dec;5(4):355-9
6643689
Neuropsychologia. 2009 Feb;47(3):835-42
19138692
Acta Psychol (Amst). 2001 Jan;106(1-2):3-22
11256338
J Neurophysiol. 1995 Jun;73(6):2608-11
7666169
Exp Brain Res. 1992;91(1):176-80
1301372
J Psychiatr Res. 1975 Nov;12(3):189-98
1202204
Curr Biol. 2006 Oct 10;16(19):1905-10
17027486
Neurology. 1967 May;17(5):427-42
6067254
Exp Brain Res. 2008 Feb;185(2):249-57
17926025
J Exp Psychol Hum Percept Perform. 1981 Aug;7(4):733-40
6457088
Eur J Neurosci. 2001 Jan;13(2):400-4
11168545
Brain. 1995 Aug;118 ( Pt 4):935-50
7655889
Exp Brain Res. 2007 Jan;176(1):193-8
17072606
Psychol Res. 2007 Jan;71(1):13-21
16311765