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2025December
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Schedule in June 2023The 60th Perceptual Frontier Seminar: Time and RhythmDate and time: Tuesday, 13 June 2023, 10:00-12:00 ProgramTalks 1, 2: 20 minutes and 5-10 minutes Q&A (1) 10:00-10:30 Auditory temporal assimilation refers to the phenomenon in which the durations of two neighboring time intervals (T1 and T2) marked by three successive sounds are perceived as closer to equal when they are physically unequal. Results obtained in behavioral experiments, which looked into the effects of preceding context (beat) on the occurrence of temporal assimilation, showed that the range in which temporal assimilation occurs can depend on the beat, causing bistable rhythm perception for physically identical rhythm patterns in some cases. The following EEG experiment suggested that the amplitude of N1 to the third sound (marking the end of T2) was related to the bistable rhythm perception. (2) 10:30-11:00 Sense of humor (i.e., what they find and do not find humorous) is culturally and temporally diverse and may change over a relatively short period. We are preparing to compare the sense of humor between young people in the past (the 1980s) and today using audiovisual recordings of a manzai (Japanese stand-up comedy) and audience reactions. In addition, we are developing AI mimicking the past sense of humor to explore which parts they would have laughed at if they had watched present manzai shows. (3) 11:00 - 11:10 The intelligibility of noise-filled checkerboard speech stimuli was investigated. Noise-filling resulted in both gains and losses in the intelligibility of checkerboard speech stimuli, depending on the combinations of the number of frequency bands, segment duration, and noise levels. The results suggest that noise-filling in checkerboard speech stimuli induces both energetic masking and phonemic restoration. (4) 11:10-11:20 The intelligibility of two-talker checkerboard speech stimuli was examined, in which two different sentences spoken by different talkers were interrupted in time and frequency and summed up without making any overlaps in frequency. Listening experiments with 22 listeners showed that the listeners successfully heard out a specific talker's sentence and ignored the other. The intelligibility curves exhibited characteristic U-shaped curves as found in the previous investigations on single-talker checkerboard speech stimuli, suggesting that the common auditory grouping mechanism worked in this case also. (5) 11:20-11:30 Recent research in the field of auditory numerosity has shown that underestimation in numerosity was related with the sound duration and the number of sounds. Since the other cues of auditory numerosity perception are still not clear, we used short sequences of steady-state sounds and frequency-modulated sounds (glides) in order to investigate whether frequency modulation would be a cue for numerosity judgments. The results (n=22) showed that the number of perceived sounds in the sequences was strongly underestimated regardless of frequency modulation, and that the numerosity of stimuli with a slope of 1 oct/sec was often more underestimated than that of stimuli with a slope of 0 oct/sec (steady-state sequences) and 3 oct/sec. (6) 11:30-11:40 The visual saltation illusion (VSI) consists of images—typically three flashes—presented rapidly to create an illusion of continuous motion. This research builds on the authors’ previous VSI study that exhibited saltation by presenting the second flash with backwards shift. The current study presents how saltation is achieved utilizing postdictive parameters under two novel conditions: a reverse shift presentation of the second flash and a vertical shift presentation of the second flash at the midpoint between the first and last flash. (7) 11:40-11:50 Wide genetical diversity is known to human color vision. Regardless of the deviated sensitivity, color vision minorities are known to demonstrate enhanced color sensitivities and thus a compensatory neural mechanism has been assumed. Our study of attention-related neural activity indicated enhanced attention to less salient color for color-vision diverse individuals, which indicated relation to enhanced color perception of color vision minorities. Note: In the evening (from 18:30), we have an informal reception in Kazuo's office on the 7th floor (709). No reservation is required.
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