摘要
The effect of intensity accents on detection of temporal irregularities is investigated in a 3×3 behavior experiment with independent variables of inter-onset-interval （IOI） length and intensity. In a 5-beat isochronous sequence, both the length of the third IOI and the intensity of succeeding beat are manipulated to three different levels separately （IOI length： longer Llo, shorter Lsh, or standard Lst. Intensity： louder Ilo, softer Iso, or standard Ist）. Subjects are required to discriminate the third IOI length with different responses respectively. The discrimination sensitivity index （d′） and response criterion （C） are assessed simultaneously for each stimulus condition. Statistical analysis reveals an asymmetric effect of intensity accents on detection of IOI deviations in an isochronous sequence, i.e. the loud accent mainly reduces the sensitivity for both shorter and standard IOIs, and the soft accent might introduce a disturbance into the temporal perception, especially in the detection of the short IOIs. Importantly, when preceding a louder accent, the short IOIs are significantly difficult to detect than the long ones, as consistent with the compensation hypothesis.
The effect of intensity accents on detection of temporal irregularities is investigated in a 3×3 behavior experiment with independent variables of inter-onset-interval （IOI） length and intensity. In a 5-beat isochronous sequence, both the length of the third IOI and the intensity of succeeding beat are manipulated to three different levels separately （IOI length： longer Llo, shorter Lsh, or standard Lst. Intensity： louder Ilo, softer Iso, or standard Ist）. Subjects are required to discriminate the third IOI length with different responses respectively. The discrimination sensitivity index （d′） and response criterion （C） are assessed simultaneously for each stimulus condition. Statistical analysis reveals an asymmetric effect of intensity accents on detection of IOI deviations in an isochronous sequence, i.e. the loud accent mainly reduces the sensitivity for both shorter and standard IOIs, and the soft accent might introduce a disturbance into the temporal perception, especially in the detection of the short IOIs. Importantly, when preceding a louder accent, the short IOIs are significantly difficult to detect than the long ones, as consistent with the compensation hypothesis.
基金
supported by the National Natural Science Foundation of China under Grant No.60736029,30870655, and 30525030
