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. Author manuscript; available in PMC: 2014 Nov 5.
Published in final edited form as: Neuropsychologia. 2012 Jun 8;50(9):2290–2302. doi: 10.1016/j.neuropsychologia.2012.05.033

Table 1.

Dopamine-related parameters in COVIS.

Parameters Ashby et al. (2003)
Filoteo et al. (2005)
Knowlton et al. (1996)
WCST/simplified WCST
YC OC PD OC PD OC PD SPD OC PD
σE2
   0.50 – – 13.00 14.00   0.30   0.85   5.00   0.25   0.35
γ 10.00 10.00 55.00   5.00 10.00 20.00 55.00 55   2.45   5.03
λ   1.50 1.50 0.15 10.00   5.00 15.00   0.15   0.05 10.47   8.66
a   1.00 – –   1.00   0.10 10.00   1.00   1.00   1.39   0.39
Dslope   0.80 0.25 0.20   0.70   0.10 00.80   0.15   0.05   0.80   0.15

Note: YC=young control; OC=old control; PD=Parkinson’s disease patients; SPD=severe PD patients. WCST/simplified WCST shows a common set of parameter values for Gotham et al. (1988) and Beatty et al. (1989).