The hole-board test is a rodent model test for measuring head-dipping activity in experimental animals. Changes in head-dipping activity have been considered to be related to anxiety by some researchers. The hole-board apparatus consists of an enclosed space, the floor of which has sixteen holes in a grid-pattern. The rodent, when placed in the apparatus, is free to dip its head through the holes in the floor; the frequency and duration of this behaviour, known as 'head-dipping' is thought to measure levels of neophilia. Such experiments are used in the field of behavioural pharmacology.
^Takeda, H.; Tsuji, M.; Matsumiya, T. (1998). "Changes in head-dipping behavior in the hole-board test reflect the anxiogenic and/or anxiolytic state in mice". European journal of pharmacology350 (1): 21–29. PMID9683010.edit
^Bilkei-Gorzó, A.; Gyertyán, I. (1996). "Some doubts about the basic concept of hole-board test". Neurobiology (Budapest, Hungary)4 (4): 405–415. PMID9200132.edit