| Species | Studies in which hippocampal lesions impaired performance | Studies in which hippocampal lesions did not impair performance |
|---|---|---|
| Delayed non-matching to sample | ||
| Humans | 97 | |
| Monkeys | 98–102 | 103 |
| Rats | 104–107 | 108,109 |
| Novel object recognition | ||
| Humans | 110,111 | |
| Monkeys | 101,102 | |
| Rats or mice | 112–115,116*,117–119,120‡,121 | 122–124,125§ |
*
Impairment when the lesion was made after the familiarization phase but not when the lesion was made before the familiarization phase.
‡
Complicated by the fact that the lesion group explored the objects less than the control group during the initial familiarization phase.
§
No impairment under standard conditions but impairment when the test box was novel.