Figure 3. Onset and Ramping single-unit activity are independent.

Activity was simultaneously recorded for a Ramping (maroon) and Onset (peach) unit in four separate sessions (four pairs). For Pair 1, activity is shown for each trial type: (A) danger, (B) uncertainty shock, (C) uncertainty omission, and (D) safety. Single-unit regression was performed for each interval. The primary regression output was a beta coefficient (β) and a p value (p) for: (E) pair 1, (F) pair 2, (G) pair three and (H) pair 4. A significant (p<0.05), negative β was only found for one interval, for one neuron pair (pair 1, interval indicated by +).