Abstract
Collecting reliable behavioral data from toddlers and preschoolers is challenging, limiting our understanding of human auditory development for these age groups. This study evaluated an observer-based procedure for measuring detection thresholds using a two-interval, two-alternative forced-choice paradigm. Listeners were normal-hearing adults and 2- to 4-year-olds. Detection performance was assessed in one of three conditions: (1) 1000-Hz warble tone in quiet; (2) disyllabic word in speech-shaped noise; or (3) disyllabic word in two-talker speech. Listeners were trained to perform a play-based, motor response whenever they heard a signal (e.g., putting a block in a bucket). An experimenter observed the child’s behavior and judged whether the signal was presented during the first or second observation interval; the experimenter was blinded to the true signal interval, so this judgment was based solely on the child’s behavior. Following training, signal level was adjusted to estimate 71% correct detection. ...
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