Fig 1.
Apparatus used in the a) forced exposure, b) aversion-avoidance, and c) approach-avoidance experiments (see supporting information: S2 Appendix).
Table 1.
Description of active and passive behavioral responses of rats during forced exposure.
Fig 2.
Rat behavior during exposure (dark bar) and re-exposure (light bar); n = 11 rats for all conditions except for n = 9 rats fox scent re- exposure.
Fig 3.
Within aversion tests consistency.
Within-tests consistency between exposure and re-exposure on the latency to avoid CO2 in a) aversion-avoidance (n = 11 rats); b) approach-avoidance (n = 11 rats) and c) average latency to avoid CO2 between aversion- and approach-avoidance tests (n = 11 rats).
Fig 4.
Forced exposure and strength of aversion.
Relationship between the average frequency of rearing during forced exposure to CO2 and the average latency to avoid CO2 in the a) aversion-avoidance (n = 11 rats) and b) approach-avoidance tests (n = 11 rats).