The question is about measures of error in motor learning.

The charts below show the performance outcome of a person estimating a 2000 ms (2 seconds) time interval in two separate conditions: 1. by reacting to an externally generated start cue and 2 by reacting to a self-generated start cue.

Question: Based on the absolute error score, which of the two sets of trials represents a person's best performance? What does this information tell you about the two performances?

Block 2: Self-Generated Start Cue Trial Trial time (ms) Target (ms) T - Target (T - Target) ( T - X ) 2130 2000 130 130 17424 2250 2000 250 250 63504 2140 2000 140 140 20164 2300 2000 300 300 91204 1600 2000 400 -400 158404 1280 2000 720 -720 51524 2150 2000 150 150 23 104 1890 2000 110 -110 11664 9 1810 2000 190 -190 35344 10 2430 2000 430 430 186624 SUM ( ) ) - 19980 SUM ( )) = 2820 -20 658960 N= 10 Absolute Error = 282 X = 1998 Constant Error = -2 Variable Error 256.70 RMSE = 335.11Block 1: External Start Cue Trial Trial time (ms) Target (ms) T - Target (T - Target) ( T - X ) 2 1850 2000 150 -150 40401 2 1640 2000 360 -360 168921 2130 2000 130 130 6241 2190 2000 190 190 19321 2130 2000 130 130 6241 2100 2000 100 100 2401 1680 2000 320 -320 137641 2550 2000 550 650 249001 1880 2000 120 120 29241 10 2360 2000 360 360 95481 SUM ( ) ) = 20510 SUM ( ) ) = 2410 510 754890 10 Absolute Error = 241 X = 2051 Constant Error 51 Variable Error = 274.75 RMSE - 279.43