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Psychometric functions obtained for the VOT stimuli in the temporal speech categorization test. The continuum steps from 1 through 12 represent gradual changes from voiced (/b/, /d/) to voiceless (/p/, /t/). Solid lines correspond to perception of the p/b series, and dashed lines reflect perception of the t/d series. The space between the solid and dashed lines represents the effect of place-of-articulation (a spectral cue) on the categorization of VOT (the temporal cue).
