Apathy and Reduced Speed of Processing Underlie Decline in Verbal Fluency following DBS

Table 1

Patient characteristics.

	Mean ± SD
Age (at first assessment; years)	57.50 ± 7.32
NART-predicted IQ	111.57 ± 11.08
Age at PD diagnosis (years)	45.55 ± 7.80
PD disease duration (years)	18.77 ± 6.12