Testing Infants' Discrimination With the Orientation Latency Procedure
Gout A., Christophe A., & Dupoux E. (2002). Infancy, 3, 249-259

 A new discrimination procedure based on the measurement of visual
 orientation latency to speech stimuli is introduced. Each participant
 listens to a series of short familiarization test trials. In each trial,
 5 to 7 centrally-presented familiarization stimuli are followed by
 laterally-presented test stimuli. Infants were found to orient faster to
 different-category than to same-category test stimuli. This result was found
 despite a high degree of prosodic variability in the familiarization and test
 stimuli introduced by changes in talker and speaking rate. The combination
 of a multitrial design with use of acoustic and prosodic variability seems
 suitable for studying the representation of phonological categories.