Figure 4.

Validation in behavioral experiment. A, The syringe pump controller was validated by using it in a shifting values licking task in a group of rats (N = 5). Rats lick at a spout to receive a liquid sucrose reward. Reward was delivered for 0.5 s and would switch every 30 s from a large-volume (∼30 μl) to a small-volume (∼10 μl) reward. B, Rats licked differently for large-volume versus small-volume rewards. Interlick intervals of all five rats were increased for small-volume rewards. C, Raw local field potential activity revealed no major differences during the syringe pump onset. D, Power spectra of the local field potential activity of one rat showed no major electrical noise at 60 Hz (under 0.2% of the 30 min session had 60 Hz electrical noise).