Table 1.
Modifying acoustic parameters of vocalizations altered neural responses in a heterogeneous manner
| ↑ | ↑/Δ | ↓ | ↓/Δ | Δ | ∼ | |
|---|---|---|---|---|---|---|
| 30 kHz harmonic | ||||||
| AM removed | 9 | 11 | 9 | 2 | 2 | 13 |
| FM removed | 8 | 6 | 13 | 2 | 2 | 15 |
| Time compressed | 9 | 3 | 13 | 4 | 3 | 18 |
| Time stretched | 10 | 10 | 9 | 1 | 3 | 12 |
| Harmonic removed | 4 | 5 | 5 | 6 | 2 | 15 |
| Fundamental removed | 5 | 3 | 9 | 6 | 1 | 14 |
| 40 kHz harmonic | ||||||
| AM removed | 6 | 7 | 7 | 1 | 1 | 6 |
| FM removed | 10 | 2 | 7 | 1 | 1 | 7 |
| Time compressed | 5 | 2 | 7 | 3 | 2 | 11 |
| Time stretched | 4 | 5 | 10 | 1 | 2 | 6 |
| Harmonic removed | 4 | 0 | 5 | 4 | 0 | 9 |
| Fundamental removed | 5 | 0 | 4 | 2 | 2 | 9 |
| Female upsweep | ||||||
| AM removed | 2 | 0 | 0 | 8 | 0 | 3 |
| FM removed | 2 | 0 | 2 | 6 | 0 | 3 |
| Time compressed | 3 | 0 | 4 | 3 | 0 | 3 |
| Time stretched | 4 | 2 | 1 | 0 | 1 | 5 |
Number of neurons that altered their spike rate or timing to each modification of each natural vocalization. Only neurons responding to one or more variant of each vocalization are included. ↑ indicates that the number of spikes increased by >20%. ↓ indicates that the number of spikes decreased by >20%. Δ indicates that the temporal pattern changed significantly, as determined by the classification rule defined in Equation 4. ∼ indicates that no significant changes occurred in either spike rate or temporal pattern.