Figure 6.

Normalized body weight of nine female SD rats under 5/2 water control schedule (i.e., access of water was controlled for 5 days followed by 2 days of free access). Weights are plotted as the means taken from a 2 week period (i.e., 10 water control days) showing the trend with which the rats gained weight under water control. Note that on days with free access to water body weight was not measured—these days were thus not included on the abscissa reading. The weight on the first day is taken as 100% (broken line). In the represented period of time these rats were first habituated to head-fixation and then trained on a Yes/No discrimination task. Rats gained up to 20% weight during the time of 5/2 water control. This is in the range of weight gain shown by female rats with free access to water.