Time allocation as a function of the strength and cost of reward.

<p>The colored symbols represent the proportion of trial time allocated to reward seeking by rat F16 as a function of price and pulse frequency. The corresponding legend and contour plots are presented in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0182120#pone.0182120.g006" target="_blank">Fig 6</a>. Each of the fitted surfaces is defined by one of the four subjective-price functions (Eqs <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0182120#pone.0182120.e013" target="_blank">7</a>, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0182120#pone.0182120.e018" target="_blank">9</a>, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0182120#pone.0182120.e024" target="_blank">12</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0182120#pone.0182120.e025" target="_blank">13</a>). Analogous plots for the remaining rats are shown in Figs A, B, C, E and F in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0182120#pone.0182120.s001" target="_blank">S1 File</a>.