Table 5.

Short-term versus long-term object and visuospatial performance

Sample–test delay	Time of day	Task
		Objecta		Object-in-placea		Object displacementa
		Mean	SEM	Mean	SEM	Mean	SEM
5 min	ZT 06	0.451	0.076	0.317	0.093	0.208	0.065
	ZT 18	0.258	0.083	0.193	0.113	0.061	0.109
24 h	ZT 06	0.248	0.213	0.182	0.105	0.252	0.156
	ZT 18	0.229	0.104	−0.142	0.102	0.032	0.117

Recognition performance was expressed as a ratio score, (N − F)/(N + F), where N and F represent the amount of time spent exploring novel versus familiar objects or objects at novel versus familiar spatial positions. The higher the score is above zero, the better the recognition performance.

^aSignificant main effect of time of day (p < 0.05).