Stimulus presentation strategies for eliciting the acoustic change complex: increasing efficiency

Area of Science:

• Auditory Neuroscience
• Speech Perception
• Neurophysiology

Background:

• The cortical acoustic change complex (ACC) is a key neural response to speech sound changes.
• Efficiently eliciting the ACC is crucial for auditory research, especially in pediatric populations.

Purpose of the Study:

• To compare the efficiency of four stimulus presentation strategies for evoking the speech-evoked ACC.
• To evaluate these strategies in both adult and child participants.

Main Methods:

• Ten adults (22-31 yrs) and nine children (6-9 yrs) participated.
• The ACC was elicited using a synthetic vowel with formant frequency changes (/u/ to /i/).
• Stimulus presentation strategies included varying interonset intervals and presentation directions.

Main Results:

• Continuous alternating stimulus presentation significantly increased ACC elicitation efficiency compared to interrupted methods.
• Reducing the interonset interval approximately doubled efficiency.
• Combining presentation directions further enhanced efficiency.

Conclusions:

• Continuous alternating stimulus presentation is the most efficient strategy for evoking the ACC in both children and adults.
• This method optimizes testing time without compromising response amplitude, making it suitable for clinical and research applications.