TABLE 1.

Training steps.

Step	Description	Advancement criteria
1. Surgery	Fiber implantation	1 day of water restriction post-recovery
2. Free drinks	Ports give water, no stimulus	Trial rate
3. Request rewards	Rewards for center port trial requests and correct responses	Trial rate
4. Only correct rewards	Request rewards disabled	400 trials completed
5. Long penalty	Increased timeout for incorrect responses	Performance > ∼70%
6. Optogenetic suppression	Laser on for 10% of trials	N/A