Table 4. Comparison of monkey performance in Evans et al. (2012) and the Experiment 3 trials with the Accumulation Task.

	Mean Number Obtained 20 items, 2-second interval			Mean Number Obtained 50 items, 2-second interval
	Evans et al.	Phase 1	% Gain	Evans et al.	Phase 4	% Gain
Gabe	3.90	9.65	147%	5.38	16.2	201%
Griffin	3.20	6.85	114%	3.50	8.2	134%
Liam	6.00	13.80	130%	9.88	20.2	104%
Lily	14.60	18.80	29%	8.13	50.0	515%
Logan	9.70	13.50	39%	6.88	24.4	255%
Nala	2.30	3.80	65%	NA	NA	NA
Wren	9.70	19.90	105%	10.94	21.0	92%

Note. This table only includes the individuals tested in both the current study and the Evans et al. (2012) study. Monkey Nala was not included in Phases 3 and 4 (50 items) in the current study due to her low performance levels in Phases 1 and 2.