Table 1.
Correlations Between Behavioral Measures in Young and Aged Rats
| Young | SD | CD | IDS | Rev | EDS | Index | Cue time |
|---|---|---|---|---|---|---|---|
| SD | — | ||||||
| CD | 0.293 | — | |||||
| IDS | −0.079 | 0.683 | — | ||||
| Rev | −0.728 | −0.045 | 0.169 | — | |||
| EDS | 0.042 | −0.049 | −0.034 | −0.041 | — | ||
| Index | 0.307 | 0.147 | −0.309 | −0.169 | 0.441 | — | |
| Cue time | 0.377 | −0.200 | 0.104 | −0.530 | 0.060 | −0.237 | — |
| Aged | SD | CD | IDS | Rev | EDS | Index | Cue time |
| SD | — | ||||||
| CD | 0.220 | — | |||||
| IDS | 0.489 | 0.235 | — | ||||
| Rev | −0.155 | 0.597 | −0.089 | — | |||
| EDS | −0.271 | −0.024 | −0.221 | 0.529 | — | ||
| Index | 0.164 | −0.211 | 0.199 | 0.004 | 0.192 | — | |
| Cue time | −0.356 | −0.289 | 0.070 | −0.474 | −0.442 | −0.337 | — |
SD, simple discrimination; CD, compound discrimination; IDS, intradimensional shift; Rev, reversal; EDS, extradimensional shift; Index, spatial-learning index; Cue time, swim time on cue-training trials (average of six trials). Correlations with cue-training swim time in aged rats are based on 12 observations instead of 13, because data for one aged rat were lost. Correlations of absolute value >0.553 (0.576 for cue-training swim time in the aged rats) are significant at the .05 level, uncorrected for multiple comparisons.