Fig. 4.

Simulated responses of the general intake model. This figure was reproduced, with permission, from de Castro and Plunkett (de Castro and Plunkett, 2002); see also Fig. 3 and main text. The model’s response to a simulated change in the environment was investigated by doubling the level of one uncompensated factor. In response to the change, the body weight became unstable and oscillated before stabilising at a higher body weight. When the weighting factor was low, the doubling of the uncompensated factor produced only a small increase in body weight. But when the weighting factor was large, the model’s output reflected a large increase in body weight.