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. Author manuscript; available in PMC: 2011 Dec 31.
Published in final edited form as: Behav Brain Res. 2009 Sep 17;215(2):318–325. doi: 10.1016/j.bbr.2009.09.014

Figure 4.

Figure 4

“What-where-when” memory. A. A discrimination ratio was used to assess preference for the older versus recent objects (“what” memory). Both sham-operated and medial prefrontal lesion animals show a significant preference for the older objects, while the hippocampal lesion animals do not. B. A discrimination ratio was also used to assess preference for the displaced versus the stationary object (“where” memory). Both hippocampal and medial prefrontal lesion animals fail to show significant “where” memory. C. In addition, a discrimination ratio was used to assess preference for the older stationary object versus the more recent objects (“when” memory). Hippocampal lesion animals do not show memory for the temporal order of object presentation. SHAM: sham-operated animals; PFCX: medial prefrontal lesions; HPX: hippocampal lesions. * p<.05.