title: A dark-light emergence test: Study at two times of the nycthemeral cycle in four-and twelve-week-old rats.
abstract: The latency to emerge from a darkened compartment to a lighted one was measured twice daily in 4-and 12-week-old rats. The test was repeated on three consecutive days: at 20.00 h on the first day, at 12.00 h and 20.00 h on the second day, and at 12.00 h and 20.00 h on the third day. The latencies of the older rats were consistently longer than those of the younger ones. While the time of day had no influence on the 4-week-old rats performances, latencies of the 12-week-old rats were considerably longer at 20.00 h than at 12.00 h.
authors.affiliation: Attachée de Recherche I.N.S.E.R.M., Laboratoire de Neurophysiologie du Conditionnement, C.H.U. Bretonneau, 37044 Tours Cedex, France.
authors.forename: N
authors.initials: N
authors.lastname: Bruneau
authors.affiliation: Laboratoire de Neurobiologie des Comportements, Université de Bordeaux II, 146 rue Léo-Saignat, 33076 Bordeaux Cedex, France.
authors.forename: H
authors.initials: H
authors.lastname: Simon
authors.affiliation: Laboratoire de Neurobiologie des Comportements, Université de Bordeaux II, 146 rue Léo-Saignat, 33076 Bordeaux Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Le Moal