User:Minyi Ruan/sandbox/Duplex perception

Experiment on Duplex perception

1. Isolated transition- the second formant transition of a synthetic two formant syllable is presented to one ear.

Base stimulus- the remaining part of the syllable is presented to the other ear.

When a base stimulus(syllable) is remained unchanged, the identity of the perceived syllable will depend on the kind of transition presented at the opposite ear. This phenomenon is duplex perception. It has been interpreted as the result of the independent operation of two perceptual systems or modes, the phonetic and the auditory mode (Cioca, & Bregman. 1989).

Hypothesis on this study/Independence hypothesis- the phonetic mode takes from the acoustic signal the information that it needs, independently of how the same sinal may be processed by auditory organization processes(Cioca, &Bregman. 1989).

Duplex perception can be weakened by capturing the isolated transition of a duplex stimulus into a sequence of identical transitions.

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Duplex perception refers to a cognitive perception phenomenon "when the second formant transition of a synthetic two formant syllable is presented to one ear(isolated transition), and the remaining part of the syllable is presented to the other ear(base stimulus), most listener perceive a complete syllable at the ear of the base stimulus and, at the same time, a brief nonspeech sound at the opposite ear. Even though the isolated sound is perceived as a nonspeech 'chrip', its spectral changes over time (for example, rising vs. falling transition) determine the perceptual identity of the syllable at the contralateral ear. This phenomenon called Duplex perception."It has been interpreted as the result of the independent operation of two perceptual systems or modes, the phonetic and the auditory mode (1989). Duplex perception can be weakened by capturing the isolated transition of a duplex stimulus into a sequence of identical transitions.