Figure 4.
The sign of the model DV reliably reflects the incipient decision throughout the delay period. Intra-trial changes in the sign of the DV conform to CoM properties expected from theoretical and behavioral studies. A) Cross-validated prediction accuracy of the monkey’s choice for different delay durations. Trials were grouped into quintiles based on delay period duration. Accurate choice prediction on short duration trials confirms that variation in DV reflects the monkey’s decision state at early points in long duration trials. Thus, intra-trial changes in DV sign are consistent with CoM as opposed to extraneous noise (see Results). B) Probability of switching from one predicted choice to another in consecutive delay quintiles declines for stronger motion (C1, motion strength ≤6%; C2, 6% <motion strength ≤20%; C3, motion strength >20%). C) Switches in the predicted choice were more likely to rectify an erroneous choice, especially for stronger motion stimuli. D) Switches were more frequent early during delay. Error bars indicate s.e.m.