Table 1.
Analysis of action performance in the test phase. Linear models exploring the effect of experimental group and cohort on the fledglings' performance of different action types during the test phase. Model A refers to successful action performance, whereas models B–C refer to the performance of unproductive attempts. All models included intercept (not shown) and were based on N = 18 birds. All analyses performed on transformed data.
| model | response | effects | d.f. | likelihood ratio χ2 | p |
|---|---|---|---|---|---|
| A | pushing proportion (out of successful action performances) | group | 1 | 13.478 | 0.0002 |
| cohort | 1 | 0.029 | 0.866 | ||
| interaction | 1 | 1.819 | 0.177 | ||
| B | unproductive attempts (total) | group | 1 | 9.856 | 0.002 |
| cohort | 1 | 12.909 | 0.0003 | ||
| interaction | 1 | 1.599 | 0.206 | ||
| C | grabbing leaf tip | group | 1 | 12.635 | 0.0004 |
| cohort | 1 | 11.897 | 0.0006 | ||
| interaction | 1 | 4.835 | 0.028 |