Figure 8.

(A) Oscillogram and sonagram of composite no. 5 (fSFM-bUFM), the best composite for unit no. 94 (FM₁–FM₃, BD = 6.4 ms). (B) PSTH shows unit’s robust response to the original composite (fSFM-bUFM; response ratio = 242%). (C) Unit failed to respond to the first syllable (fSFM). (D) Unit failed to respond to the second syllable (bUFM). (E) Oscillogram and sonagram of the filtered composite (first syllable, low-pass filtered at 35 kHz; second syllable, high-pass filtered at 65 kHz). (F) PSTH shows unit’s robust response to minimal spectral elements of composite fSFM-bUFM necessary to excite this unit to a level equivalent to the original. (G) PSTH shows unit’s weak response to the reversed composite. (H) PSTH shows unit’s weak response to the reversed order of syllables of composite no. 5 (i.e., BA).