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Dario,
Following up on Steven Greenberg's pertinent point about about modeling an exponential decay function rather than a time window: in Huron & Parnutt (1993) we reviewed research on echoic memory to that
point and then modeled perceptual data related to tonality. We found an optimum "half life" for pitch-related memory to be 0.9s (page 163).
Huron, D., & Parncutt, R. (1993). An improved model of tonality perception incorporating pitch salience and echoic memory. Psychomusicology, Vol. 12, No. 2, pp. 154-171.
Available at: http://www.musiccog.ohio-state.edu/home/data/_uploaded/pdf/Huron_Parncutt.pdf
Best wishes with your work,
David Huron
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