Ideas galore: Examining the moods of a modern caveman.Peter Totterdell -2004 -Behavioral and Brain Sciences 27 (2):272-273.detailsA self-experiment by Roberts found that watching faces on early morning television triggered a delayed rhythm in mood. This surprising result is compared with previous research on circadian rhythms in mood. I argue that Roberts' dual oscillator model and theory of Stone-Age living may not provide the explanation. I also discuss the implications of self-experiments for scientific practices.