Figure 4. Effect of food deprivation, inequality and cage-mate change on pain behavior during the formalin test.

The observation period is divided into 20 blocks of 3 minutes each. In all stressed animals as compared to controls, pain behaviors did not appear in chronic phase of formalin test (Data are means ± SEM, females; Control and FD+See+CC: n = 8, males; Control and FD+See+CC: n = 7).