Apathy in Parkinson’s Disease: An Electrophysiological Study

Table 1

Correlation between the apathy score (during OFF and ON periods) and electrophysiological cognitive, thymic, and motor data.

Data	Apathy score (OFF period)		Apathy score (ON period)
	𝑃	𝜌	𝑃	𝜌
Electrophysiological
P300 amplitude in Cz	0.008	−0.541	0.5135	0.133
P300 amplitude in Pz	0.0279	−0.449	0.2911	0.215
P300 average amplitude in Cz	0.0293	−0.445	0.5633	0.118
P300 average amplitude in Fz	0.0374	−0.425	0.8874	−0.029
P300a amplitude in Fz	0.0707	−0.369	0.0014	−0.668
Cognitive
Verbal fluency (animals)	0.0153	−0.495	0.1608	−0.286
Verbal fluency (letter M)	0.0009	−0.679	0.0083	−0.539
Verbal fluency (boy + fruit names)	0.0159	−0.492	0.4786	−0.145
Stroop test (SR-SP)	0.1795	−0.274	0.1769	−0.276
Wisconsin (number of series)	0.0098	−0.527	0.0037	−0.593
Wisconsin (number of mistakes)	0.0037	0.592	0.0019	0.633
Wisconsin (perseveration percentage)	0.1097	0.327	0.0342	0.4322
Thymic
HAD (depression)	0.0003	0.739	0.0015	0.647
HAD (anxiety)	0.0532	0.0532	0.3552	0.189
Motor
UPDRS III (total score)	0.1051	0.331	0.012	0.513
UPDRS III (axial score)	0.0594	0.385	0.0201	0.474

𝑃: probability; 𝜌: coefficient of correlation.