Table 1. The chronic mild stress protocol during the first week of the experiment.

This schedule were followed for another three week.

Week 1	Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
Empty cage		10.00–13.00 h			9.30–12.30 h		15.00–17.00 h
Damp sawdust	9.00–12.00 h		9.00–12.00 h
Cages tilt at 45°	14.00–17.00 h	14.00–17.00 h		10.00–13.00 h		9.00–10.30 h
Water deprivation			17.00 h →	9.00 h
Empty cage with water on the bottom				14.00–16.00 h			11.00–13.00 h
Continuous overnight illumination	17.00 h →	9.00 h			17.00 h →	9.00 h
Food deprivation						17.00 h →	9.00 h
Light/dark succession every 15 min			23.00 h →	2.00 h