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Directionality of SEF activity. A: mean spike rates for all target trajectories in the delay period (left) and in the movement period (right) for an example go neurons that were not directionally tuned. B: mean spike rates for all trajectories for a directionally tuned nogo neuron. C: directionality index (DI) values for all neurons in standard go/nogo trials the delay (left) and movement periods (right). D: DI values for all neurons in the extremely difficult go/nogo trials.
