transient was superimposed on a slow, sustained increase). For both gamma-50 and gamma-80, these transient responses were absent during non-rewarded error laps (red line) but not from matched rewarded laps (blue line), indicating that the presence or absence of reward modulates gamma power. However, we noted that the animals' average speed (to which both head movements and running contribute) showed some differences between rewarded and non-rewarded trials (Figure 9B), so it is possible that there is a contribution of movement differences to these effects.
