Table 2. Mental Rotation, Executive Functioning, and Monitoring Frequency Data as a Function of Age and Sex with Standard Deviations in Parenthesis.

Group	Monitoring Frequency	Mental Rotation	Executive Functioning
Old Female	20.34 (9.19)	.16 (.13)	.65 (.13)
Old Male	20.66 (8.46)	.21 (.13)	.69 (.15)
Young Female	31.68 (8.87)	.34 (.13)	.76 (.12)
Young Male	36.83 (12.45)	.47 (.16)	.79 (.16)

Note. Monitoring frequency  =  number of counter checks/min.

Executive functioning  =  proportion correct in the matrix monitoring task.