On the internal perceptual structure of distinctive features: The [voice] contrast.

Several fixed classification experiments test the hypothesis that F(1), f(0), and closure voicing covary between intervocalic stops contrasting for [voice] because they integrate perceptually. The perceptual property produced by the integration of these acoustic properties was at first predicted to be the presence of low frequency energy in the vicinity of the stop, which is considerable in [+voice] stops but slight in [-voice] stops. Both F(1) and f(0) at the edges of vowels flanking the stop were found to integrate perceptually with the continuation of voicing into the stop, but not to integrate with one another.