Table 2.
Summary of neural data
| Pigeon type | Anesthesia | Recording site | Electrode type | Units | Magneto-sensitive unit |
|---|---|---|---|---|---|
| 4 Normal | Urethane | Left Tectum | 1-Channel | 4 | 1 |
| 1 Normal | Urethane | Right Tectum | 1-Channel | 1 | 0 |
| 12 Normal | Ket/Xil | Left Tectum | 1-Channel | 12 | 0 |
| 3 Normal | Awake | Left Tectum | 1-Channel | 7 | 0 |
| 1 Normal | Awake | Right IPC | 1-Channel | 1 | 0 |
| 1 Homing | Awake | Left Tectum | 1-Channel | 6 | 0 |
| 2 Homing | Awake | Left Tectum | 16-Channel | 60 | 0 |
| 24 Pigeons | – | – | – | 91 | 1 |
Summary of 91 recording sites, from 24 pigeons under many different conditions (type of anesthesia, pigeon type, recorded nuclei). Because a systematic exploration was time consuming (A complete scan at 4°/s took almost 1 h. When all the speeds and conditions were considered, it took between 3 and 4 h to complete a data gathering cycle.), it was not possible to test all units under all scanning conditions