Preliminary evaluation of a two-interval, two-alternative infant behavioral testing procedure
Jenna Browning1, Emily Buss2, Lori J Leibold3
1Department of Allied Health Sciences, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599 jenna_browning@med.unc.edu.
Insights
This study found that a new two-interval forced-choice method is a feasible and efficient way to test infant hearing. This observer-based procedure required fewer trials for infants to detect sounds compared to older methods.
Area of Science:
- Audiology
- Developmental Psychology
- Psychophysics
Background:
- Infant hearing assessment is crucial for early intervention.
- Observer-based psychophysical procedures are vital for evaluating auditory function in infants.
- Previous methods faced limitations in efficiency and controlling for response bias.
Purpose of the Study:
- To assess the feasibility and efficiency of a novel observer-based, two-interval forced-choice psychophysical testing procedure for infants.
- To compare the performance of this new method against existing single-interval procedures.
- To determine if the two-interval procedure effectively mitigates observer and listener response bias.
Main Methods:
- An observer-based, two-interval forced-choice psychophysical testing procedure was employed.
- Eleven infants aged 7-9 months participated in the study.
- A criterion of 80% correct detection of a 50-dB sound pressure level noise band was used.
Main Results:
- Ten out of eleven infants successfully met the detection criterion within a single session.
- The two-interval procedure required significantly fewer trials to reach criterion compared to previously reported single-interval methods.
- Preliminary data suggest the procedure controls for listener response bias.
Conclusions:
- The observer-based, two-interval forced-choice procedure is a feasible and efficient method for infant hearing testing.
- This method shows promise for improving the accuracy and speed of infant psychophysical evaluations.
- Further research is warranted to validate these findings in larger infant populations.
Abstract:
The purpose of this study was to evaluate the feasibility and efficiency of an observer-based, two-interval forced-choice infant psychophysical testing procedure. Ten of 11 infants (7-9 months of age) achieved a criterion of 80%-correct detection of a 50-dB sound pressure level noise band in a single testing session. Fewer trials were needed to reach criterion using the two-interval procedure than previously reported for the single-interval observer-based psychophysical procedure [Olsho, Koch, Halpin, and Carter (1987). Devel. Psychol. 23, 627-640]. These results provide preliminary evidence that the two-interval procedure is feasible and efficient while controlling for observer and listener response bias.
