Lab lighting can also skew the outcomes. Rats exposed to constant white light, for example, have elevated baseline corticosterone concentrations in plasma (Sche

Lab lighting can also skew the outcomes. Rats exposed to constant white light, for example, have elevated baseline corticosterone concentrations in plasma (Scheving & Pauly, 1966). There are a few of such variables which it's not clear are taken into account or not, and probably more are unknown.