the larger reward, then discounting of that assessment based upon time would be unreliable. Importantly, the adjusted amount derived at the zero delay was not the result of innate side bias, as the 75% adjusted amount requirement meant that the mice preferred the large reinforcer lever over the other lever, which they had initially preferred in the beginning of shaping. Within 5 days of reaching the zero delay criterion, delays of 1, 2, 4, and 8 seconds were introduced in ascending order. Mice were tested for 3 consecutive sessions at each delay, and each session had a single fixed delay for the duration of that session. Dependent variables such as total trials, percent forced trials, consumption, and choice sipper access were means taken from the means of those 3 sessions (or 2, if they did not complete at least 20 trials during a session.) Indifference points for each mouse were determined by taking the median adjusted amount for the last 20 choice trials completed, and then averaging those values across 3 sessions within a programmed delay. Sessions were limited to 1 hour or 60 choice trials, whichever came first. All daily data from mice that completed fewer than 20 trials
