Entrainment of the circadian rhythm of wheel-running activity is phase shifted by ablation of the intergeniculate leaflet.
The phase angle of entrainment of golden hamster wheel-running activity was determined before and after bilateral destruction of the intergeniculate leaflet (IGL). Animals were maintained under continuous dim light which rhythmically varied in intensity (10-5 lux) in the form of a sine wave with a 24 h period. The phase angle of entrainment changed significantly following IGL ablation suggesting a role for the IGL in entrainment.
Pickard
G E
GE
Department of Anatomy, West Virginia University School of Medicine, Morgantown 26506.
D000818:Animals; D002940:Circadian Rhythm; D006224:Cricetinae / Q000502:physiology*; D005829:Geniculate Bodies / Q000502:physiology*; D008297:Male; D008647:Mesocricetus / Q000502:physiology*