Table 1 The acoustic stimuli used in phonotaxis and electrophysiological experiments
Treatment stimuli | Control stimuli | ||||
|---|---|---|---|---|---|
Stimuli | Manipulation methods | Predictions | Stimuli | Manipulation methods | Predictions |
For phonotaxis experiment | |||||
OC | Original call with six notes | Females prefer OC | OCC | Each of the first five notes of OC is reversed in situ respectively | No preference in females due to lack of information coherence |
OCP | Increasing the pitch of the 6th note of OC | Changing acoustic properties of the 6th note and having no effect on female preference | OCPC | Manipulation similar to OCC | Consistent with OCC |
OR | Reversing the 6th note of OC in situ | Reducing female preference due to information coherence violations and acoustic properties changes | ORC | Manipulation similar to OCC | Consistent with OCC |
OS | Replacing the 6th note of OC by silence | Leading to anticipation of information input and having no effect on female preference | OSC | Manipulation similar to OCC | Consistent with OCC |
OQ | Replacing the 6th note of OC by a sympatric species’ call note | Consistent with OR | OQC | Manipulation similar to OCC | Consistent with OCC |
OW | Replacing the 6th note of OC by white noise | Consistent with OR | OWC | Manipulation similar to OCC | Consistent with OCC |
For electrophysiological experiment | |||||
OC | The same as above | Eliciting smaller N400 and LPC | OCC | The same as above | Eliciting smaller N400 and LPC |
OQ | The same as above | Eliciting greater N400 and LPC | OQC | Manipulation similar to OCC | Eliciting smaller N400 and LPC |
OW | The same as above | Eliciting greater N400 and LPC | OWC | Manipulation similar to OCC | Eliciting smaller N400 and LPC |
OCP | The same as above | Eliciting greater LPC | OCPC | Manipulation similar to OCC | Eliciting smaller N400 and LPC |
OQP | Increasing the pitch of the 6th component of OQ | Eliciting greater LPC compared to OQ | OQPC | Manipulation similar to OCC | Eliciting smaller N400 and LPC |
OWP | Increasing the pitch of the 6th component of OW | Eliciting comparable LPC compared to OW due to minor difference between OWP and OW | OWPC | Manipulation similar to OCC | Eliciting smaller N400 and LPC |
