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2025December
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Schedule in November 2020The 51st Perceptual Frontier Seminar: Analysis of Visual Images and SpeechDate and time: Wednesday, 11 November 2020, 16:40-18:10 Program16:40-17:10 An introduction to visualization by p-flow: Gradient- and feature-based optical flow and vector fields extracted from image analysis. To formulate an algorithm or pseudo flow or p-flow that extracts the critical information (“cues”) to the flexible primate visual motion perception from natural movies, feature vectors were extracted from a local motion vector field, tracked between successive frame pairs, visualized with moving dots and were used in demonstrations and psychophysical experiments as stimuli. The results support validity of the algorithm as “definition” of the “cues” to human visual motion perception, which is specifically suited to ecological stimuli such as self-motion, deformation of nonrigid objects and animates, and clarify precisely at what the primate visual system is good or bad, veridical or illusory, and optimized or subsidiary. 17:10-17:25 How the acoustic correlates of English obstruents appear in multivariate analysis To identify the acoustic correlates of obstruents, we performed an origin-shifted factor analysis of critical-band-filtered British English speech. Our results confirm that obstruents delimit syllables rather than constitute syllable nuclei, showing that multivariate analysis of acoustic natures of speech can provide insight into English phonology. 17:25-17:55 Evaluative processing of single-exposed food images This study was conducted in order to disambiguate how the type of evaluation determines the relationship between viewing time and preference. The stimuli consisted of a set of 160 naturalistic food images that had been drawn from a database for experimental research (FoodPics). For all 26 Japanese participants, manual responses, as well as gaze metrics, were recorded. An eye-tracking device (EyeLink 1000) with sufficient reliability for the present purpose has been used. The data provided firm evidence against the notion that longer viewing facilitates preference formation. After the talks, we will get together in Kazuo's office, Room 709 on the 7th Floor of Building 3. |
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What's New | Greetings | Schedule | Members | Contact | Japanese |
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