Categorical Perception as a Function of Stimulus Quality
Adrianus J. van Hessen, M. E. H. Schouten · Phonetica · 1999
A number of experiments were carried out in order to test the hypothesis that categorical perception of speech stimuli is a function of synthesis quality - specifically, that the greater complexity of more natural speech stimuli makes it difficult for listeners to focus on particular stimulus parameters as psychoacoustic cues. The results show that there is an increase in categorical perception as synthesis quality improves from a simple synthesis by rule, via LPC synthesis, to a much more complex type called sinewave generation.