The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Seungmoon Choi - One of the best experts on this subject based on the ideXlab platform.
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WHC - Perceptual Space of Regular Homogeneous Haptic Textures Rendered Using Electrovibration
2019 IEEE World Haptics Conference (WHC), 2019Co-Authors: Sunung Mun, Hojin Lee, Seungmoon ChoiAbstract:This paper is concerned with the Perceptual structure of homogeneous and deterministic haptic textures rendered by an electrovibration display. Textures were modeled using 32 regular tessellations of polygons by changing the polygon, density, edge width, pixel intensity, and image reversal. We conducted a Perceptual experiment to estimate the pairwise dissimilarities between the 32 textures using the cluster sorting procedure. We then applied multi-dimensional scaling to the data and obtained a Perceptual Space that accounted for the effects of the five design variables on texture perception. The subjective impressions of the textures were also rated against eight adjective pairs. We projected the rating results into the Perceptual Space to find adequate Perceptual dimensions for the texture perception. Our results contribute to designing Perceptually distinctive textures elicited by electrovibration with an appropriate understanding of their subjective qualities.
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Perceptual Space of Superimposed Dual-Frequency Vibrations in the Hands.
PloS one, 2017Co-Authors: Inwook Hwang, Jeongil Seo, Seungmoon ChoiAbstract:The use of distinguishable complex vibrations that have multiple spectral components can improve the transfer of information by vibrotactile interfaces. We investigated the qualitative characteristics of dual-frequency vibrations as the simplest complex vibrations compared to single-frequency vibrations. Two psychophysical experiments were conducted to elucidate the Perceptual characteristics of these vibrations by measuring the Perceptual distances among single-frequency and dual-frequency vibrations. The Perceptual distances of dual-frequency vibrations between their two frequency components along their relative intensity ratio were measured in Experiment I. The estimated Perceptual Spaces for three frequency conditions showed non-linear Perceptual differences between the dual-frequency and single-frequency vibrations. A Perceptual Space was estimated from the measured Perceptual distances among ten dual-frequency compositions and five single-frequency vibrations in Experiment II. The effect of the component frequency and the frequency ratio was revealed in the Perceptual Space. In a percept of dual-frequency vibration, the lower frequency component showed a dominant effect. Additionally, the Perceptual difference among single-frequency and dual-frequency vibrations were increased with a low relative difference between two frequencies of a dual-frequency vibration. These results are expected to provide a fundamental understanding about the perception of complex vibrations to enrich the transfer of information using vibrotactile stimuli.
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Perceptual Space of amplitude modulated vibrotactile stimuli
World Haptics Conference, 2011Co-Authors: Gunhyuk Park, Seungmoon ChoiAbstract:Amplitude-modulated vibrotactile stimuli have been broadly used for tactile perception and rendering research. However, understandings of the Perceptual relations between amplitude-modulated vibrations are not comprehensive yet. In this paper, we present a Perceptual analysis on the identifying characteristics of amplitude-modulated vibrations and their Perceptual relations. We estimated the Perceptual dissimilarities among one carrier and seven amplitude-modulated sinusoidal vibrations (150-Hz carrier frequency; seven modulation frequencies in 1–80 Hz) in a psychophysical experiment. The dissimilarity scores were inspected using multi-dimensional scaling to obtain an appropriate Perceptual Space. The optimal Perceptual Space was two-dimensional, where the vibration points exhibited a circular formation. The analysis showed that the pulse-like low-frequency sensation of an amplitude-modulated vibration increased for very low modulation frequencies (1–10 Hz), then decreased for higher modulation frequencies (10–80 Hz), and eventually converged to the smooth vibrational sensation of the 150-Hz carrier signal. It also suggested that the envelope waveform is primary information for the discrimination of amplitude-modulated signals, instead of their spectral energy distributions. These findings can contribute to the design of Perceptually salient and distinctive vibrotactile signals using amplitude modulation.
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World Haptics - Perceptual Space of amplitude-modulated vibrotactile stimuli
2011 IEEE World Haptics Conference, 2011Co-Authors: Gunhyuk Park, Seungmoon ChoiAbstract:Amplitude-modulated vibrotactile stimuli have been broadly used for tactile perception and rendering research. However, understandings of the Perceptual relations between amplitude-modulated vibrations are not comprehensive yet. In this paper, we present a Perceptual analysis on the identifying characteristics of amplitude-modulated vibrations and their Perceptual relations. We estimated the Perceptual dissimilarities among one carrier and seven amplitude-modulated sinusoidal vibrations (150-Hz carrier frequency; seven modulation frequencies in 1–80 Hz) in a psychophysical experiment. The dissimilarity scores were inspected using multi-dimensional scaling to obtain an appropriate Perceptual Space. The optimal Perceptual Space was two-dimensional, where the vibration points exhibited a circular formation. The analysis showed that the pulse-like low-frequency sensation of an amplitude-modulated vibration increased for very low modulation frequencies (1–10 Hz), then decreased for higher modulation frequencies (10–80 Hz), and eventually converged to the smooth vibrational sensation of the 150-Hz carrier signal. It also suggested that the envelope waveform is primary information for the discrimination of amplitude-modulated signals, instead of their spectral energy distributions. These findings can contribute to the design of Perceptually salient and distinctive vibrotactile signals using amplitude modulation.
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Perceptual Space and adjective rating of sinusoidal vibrations perceived via mobile device
IEEE Haptics Symposium, 2010Co-Authors: Inwook Hwang, Seungmoon ChoiAbstract:In the past five years, how to utilize the haptics technology in the mobile device to improve its limited user interface has emerged as an attractive research topic. In this paper, we report two kinds of Perceptual data related to vibrotactile signals perceived through a mobile device held in the hand. In Experiment I, we estimated Perceptual dissimilarities between sinusoidal vibrations with seven frequencies in 40–250 Hz and two amplitudes of 30 and 40 dB SL. Multi-dimensional scaling was then applied to the Perceptual distances, and led to a two-dimensional Perceptual Space. In the Perceptual Space, the vibrations of the two amplitudes formed distinct groups. The two groups showed similar structures with respect to the frequency variation. In particular, two Perceptual dimensions that spanned a low frequency range (40–100 Hz) and a high frequency range (100–250 Hz) were close to be orthogonal. In Experiment II, we evaluated the subjective qualities of sinusoidal vibrations with different frequencies via adjective rating. Thirteen adjective pairs were carefully selected, and rated for the sinusoidal vibrations played through the mobile device. The results were regressed to the Perceptual Space, revealing several adjective pairs that can largely account for the distributions of vibration points in the Perceptual Space, such as ‘dark-bright,’ ‘dull-clear,’ ‘slow-fast,’ ‘vague-distinct,’ ‘thick-thin,’ and ‘heavy-light.’ The findings of this paper can help understand the Perceptual characteristics and subjective impressions of mobile device vibrations.
Junji Watanabe - One of the best experts on this subject based on the ideXlab platform.
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Visualizing Individual Perceptual Differences Using Intuitive Word-Based Input.
Frontiers in psychology, 2019Co-Authors: Maki Sakamoto, Junji WatanabeAbstract:Numerous studies have investigated the fundamental dimensions of human tactile Perceptual Space using a wide range of materials. Participants generally touch materials and quantitatively evaluate variations in tactile sensations for pairs of adjectives pertaining to the material properties, such as smooth-rough and soft-hard. Thus, observers evaluate their Perceptual experiences one by one in terms of adjective pairs. We previously proposed an alternative method of qualitative evaluation of tactile sensations. Our system can automatically estimate ratings of fundamental tactile properties from single sound-symbolic words. We were able to construct a word-based Perceptual Space by collecting words that express tactile sensations and applying them to the system. However, to explore individual differences in Perceptual Spaces, different databases for converting words into ratings of adjective pairs are required for each individual. To address this, in the present study we created an application that can automatically generate an individualized Perceptual Space by moving only a few words in the initial word-based Perceptual Space. In addition, we evaluated the efficacy of the application by comparing the tactile Perceptual Space before and after use.
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automatic estimation of multidimensional ratings from a single sound symbolic word and word based visualization of tactile Perceptual Space
IEEE Transactions on Haptics, 2017Co-Authors: Ryuichi Doizaki, Junji Watanabe, Maki SakamotoAbstract:Several pairs of Japanese adjective words pertaining to material's properties, such as roughness and hardness, have been used in Japanese studies to quantitatively evaluate variations in tactile sensations. This method asks observers to analyze their Perceptual experiences one by one. An alternative notion is that human Perceptual recognition is performed as a whole rather than by using fragmented factors. Based on this notion, we propose a system that can automatically estimate multidimensional ratings of touch from a single sound-symbolic word that has been spontaneously and intuitively expressed by a user. When a user inputs a sound-symbolic word into the system, the system refers to a database of phonemes and their auditory impressions, and calculates ratings in terms of 26 pairs of fundamental scales of touch. The estimated ratings of sound-symbolic words enable us to visualize a tactile Perceptual Space. Our study provides an alternative method for estimating the fine quality of tactile sensations.
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AAAI Spring Symposia - A System to Visualize Tactile Perceptual Space of Young and Old People
2016Co-Authors: Mai Kosahara, Junji Watanabe, Yasuaki Hiranuma, Ryuichi Doizaki, Takahide Matsuda, Maki SakamotoAbstract:Sound symbolic words are known to exhibit synesthetic associations between sounds and sensory experience. We constructed a system that visualizes the relationship between sound symbolic words and standardized tactile materials on the tactile Perceptual Space map. The system enables us to compare the affective tactile evaluations of young people with old people.
Kenny R. Coventry - One of the best experts on this subject based on the ideXlab platform.
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Spatial demonstratives and Perceptual Space: To reach or not to reach?
Cognition, 2019Co-Authors: Michela Caldano, Kenny R. CoventryAbstract:There is much debate regarding the relationship between spatial demonstratives ('this' or 'that') and Perceptual Space. While some have argued for a close mapping between the use of demonstratives and the peripersonal/extrapersonal Space distinction (Coventry et al., 2008, 2014; Diessel, 2014), others have argued that distance from a speaker does not affect demonstrative choice (e.g. Kemmerer, 1999; Peeters, Hagoort, & Ozyurek, 2015). We investigated the mapping between demonstratives and Perceptual Space across sagittal and lateral planes. Manipulation of object location on the lateral plane, and the hand used to point at objects (left, right) afforded a critical test of the the mapping between demonstratives and the reachability of objects. Indeed, we found that objects positioned at the same locations were described using this when the hand pointing at the object could reach it. Furthermore, we found no overall effects of handedness or visual field on demonstratives choice. This provides strong support for a mapping between Perceptual Space and the use of demonstratives. Such a mapping may help explain the influence of other variables on demonstrative choice, including interactive factors.
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spatial demonstratives and Perceptual Space describing and remembering object location
Cognitive Psychology, 2014Co-Authors: Kenny R. Coventry, Debra Griffiths, Colin HamiltonAbstract:Spatial demonstratives - terms including this and that - are among the most common words across all languages. Yet, there are considerable differences between languages in how demonstratives carve up Space and the object characteristics they can refer to, challenging the idea that the mapping between spatial demonstratives and the vision and action systems is universal. In seven experiments we show direct parallels between spatial demonstrative usage in English and (non-linguistic) memory for object location, indicating close connections between the language of Space and non-linguistic spatial representation. Spatial demonstrative choice in English and immediate memory for object location are affected by a range of parameters - distance, ownership, visibility and familiarity - that are lexicalized in the demonstrative systems of some other languages. The results support a common set of constraints on language used to talk about Space and on (non-linguistic) spatial representation itself. Differences in demonstrative systems across languages may emerge from basic distinctions in the representation and memory for object location. In turn, these distinctions offer a building block from which non-spatial uses of demonstratives can develop.
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CogSci - Spatial Demonstratives, Perceptual Space, and Linguistic Diversity
Cognitive Science, 2011Co-Authors: Kenny R. Coventry, Colin Hamilton, Debra GriffithsAbstract:Spatial Demonstratives, Perceptual Space, and Linguistic Diversity Kenny R. Coventry (kenny.coventry@northumbria.ac.uk), Colin Hamilton (colin.hamilton@northumbria.ac.uk), and Debra Griffiths (debbie.griffiths@northumbria.ac.uk) Cognition and Communication Research Centre, Northumbria University, Newcastle Upon Tyne, NE1 8ST, United Kingdom Keywords: Spatial and temporal demonstratives; peripersonal versus extrapersonal Space; object location memory Extended Abstract Communication involves a combination of speech and gestures, which afford joint attention between speaker and interlocutor (Tomasello, 1999, 2003; Kita, 2003). Characterizing the mapping between language and the vision and action systems is therefore essential in order to understand both normal and disordered communication. In a series of five experiments we target this mapping with respect to one the most central components of natural language semantics - spatial demonstratives. Although there is a large literature on the mapping between spatial language and Space, including prepositions and Space, (e.g. Burigo & Coventry, 2010; Coventry & Garrod, 2004; Coventry, Cangelosi, Monrouxe, Joyce, & Richardson, 2010; Coventry, Tenbrink & Bateman, 2010) and quantifiers and Space (e.g. Coventry, Cangelosi, Newstead, & Bugmann, 2010), there is a notable absence of empirical work on demonstratives. Yet spatial demonstratives, such as this and that, are more closely associated with deictic gestures than any other linguistic items (Diessel, 2006; Enfield, 2003; Levinson, 2004), they occur in all languages, are among the most frequent terms within a language, appear early in child language acquisition, and philologically emerge as the earliest traceable words in languages (Deutscher, 2005; Diessel, 2006). Therefore demonstratives are a natural place to start to examine how language and vision and action map onto one another, and whether they are associated with the same or different underlying representations. The absence of work on demonstratives in cognitive science generally is even more surprising when one considers that demonstratives occur in spatial and non- spatial contexts. This can be used to refer to objects or events in close temporal proximity, while that can be used to refer to such objects and events out of temporal focus (see Diessel, 1999 for discussion). In the context of work examining the extent to which Space acts as a structuring tool for non-spatial domains (see for example Lakoff & Johnson, 1980, 1999; Casasanto & Boroditsky, 2008), demonstratives therefore afford an excellent test domain within which to examine the relationship between different uses of the same lexical items. Recently Coventry, Valdes, Castillo, and Guijarro- Fuentes (2008; see also Bonfiglioli et al., 2009) tested the mapping between Perceptual Space and demonstrative use for the first time using a new methodology designed to elicit spatial demonstratives without speakers realizing that their language was being tested. Participants played a ‘memory game’ where the goal of the game was to remember the positions of objects (colored shapes) placed on 12 colored dots along the midline of a large conference table. Participants were informed that they were taking part in an experiment on the effects of language on memory for object location and that they were in the ‘language condition.’ They were first told that cards would be read out with a placement instruction (e.g., “You place green triangle on red dot”). Following placement, participants were instructed that they had to point to each object naming it using a combination of just three words: a demonstrative, a color and a shape (e.g., this/that red triangle), so that everyone in the ‘language condition’ experienced the same level of language coding. Coventry et al. manipulated the distance between the participant and placed object, whether participants used their hand or a 70cm stick when pointing at the objects placed, and who placed the object. These latter two manipulations were motivated by neuropsychological work suggesting contact with objects is important for the extension of peripersonal Space. Berti and Frassinetti (2000) document the case of a patient who showed a dissociation between near and far Space in the manifestation of neglect, illustrated by impaired performance on a line bisection task in near Space but not in far Space when using a light pen to perform the task. However when the participant performed the same task using a stick, performance on the task in far Space deteriorated, mirroring the performance in near Space. Berti and Frassinetti argue that the stick extended the body remapping far Space as near Space. The results of this first study using the memory game method revealed that the use of the stick extended the use of this in English and este in Spanish to the region beyond the end of the hand to the end of the stick, mirroring the effects found for the extension of near Space in neglect patients. While it would seem intuitive that there is a mapping between near-far Space and the use of spatial demonstratives, this view has been challenged (Kemmerer, 2006). Notably while a proximal versus distal contrast appears to be the most common demonstrative contrast across languages (Diessel, 2005), languages make a range of more diverse contrasts in their demonstrative systems, including person centered contrasts (Japanse), whether an object is visible or not (Tiriyo), and whether is owned by the speaker (Supyire)(Diessel, 1999, 2005). In this talk we report the results of five experiments using the memory game paradigm designed to 1) tease
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Language within your reach: near-far Perceptual Space and spatial demonstratives.
Cognition, 2008Co-Authors: Kenny R. Coventry, Berenice Valdés, Alejandro Castillo, Pedro Guijarro-fuentesAbstract:Spatial demonstratives (this/that) play a crucial role when indicating object locations using language. However, the relationship between the use of these proximal and distal linguistic descriptors and the near (peri-personal) versus far (extra-personal) Perceptual Space distinction is a source of controversy [Kemmerer, D. (1999). “Near” and “far” in language and perception. Cognition 73, 35–63], and has been hitherto under investigated. Two experiments examined the influence of object distance from speaker, tool use (participants pointed at objects with their finger/arm or with a stick), and interaction with objects (whether or not participants placed objects themselves) on spatial demonstrative use (e.g. this/that red triangle) in English (this/that) and Spanish (este/ese/aquel). The results show that the use of demonstratives across two languages is affected by distance from speaker and by both tool use and interaction with objects. These results support the view that spatial demonstrative use corresponds with a basic distinction between near and far Perceptual Space.
Inwook Hwang - One of the best experts on this subject based on the ideXlab platform.
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Perceptual Space of Superimposed Dual-Frequency Vibrations in the Hands.
PloS one, 2017Co-Authors: Inwook Hwang, Jeongil Seo, Seungmoon ChoiAbstract:The use of distinguishable complex vibrations that have multiple spectral components can improve the transfer of information by vibrotactile interfaces. We investigated the qualitative characteristics of dual-frequency vibrations as the simplest complex vibrations compared to single-frequency vibrations. Two psychophysical experiments were conducted to elucidate the Perceptual characteristics of these vibrations by measuring the Perceptual distances among single-frequency and dual-frequency vibrations. The Perceptual distances of dual-frequency vibrations between their two frequency components along their relative intensity ratio were measured in Experiment I. The estimated Perceptual Spaces for three frequency conditions showed non-linear Perceptual differences between the dual-frequency and single-frequency vibrations. A Perceptual Space was estimated from the measured Perceptual distances among ten dual-frequency compositions and five single-frequency vibrations in Experiment II. The effect of the component frequency and the frequency ratio was revealed in the Perceptual Space. In a percept of dual-frequency vibration, the lower frequency component showed a dominant effect. Additionally, the Perceptual difference among single-frequency and dual-frequency vibrations were increased with a low relative difference between two frequencies of a dual-frequency vibration. These results are expected to provide a fundamental understanding about the perception of complex vibrations to enrich the transfer of information using vibrotactile stimuli.
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Perceptual Space and adjective rating of sinusoidal vibrations perceived via mobile device
IEEE Haptics Symposium, 2010Co-Authors: Inwook Hwang, Seungmoon ChoiAbstract:In the past five years, how to utilize the haptics technology in the mobile device to improve its limited user interface has emerged as an attractive research topic. In this paper, we report two kinds of Perceptual data related to vibrotactile signals perceived through a mobile device held in the hand. In Experiment I, we estimated Perceptual dissimilarities between sinusoidal vibrations with seven frequencies in 40–250 Hz and two amplitudes of 30 and 40 dB SL. Multi-dimensional scaling was then applied to the Perceptual distances, and led to a two-dimensional Perceptual Space. In the Perceptual Space, the vibrations of the two amplitudes formed distinct groups. The two groups showed similar structures with respect to the frequency variation. In particular, two Perceptual dimensions that spanned a low frequency range (40–100 Hz) and a high frequency range (100–250 Hz) were close to be orthogonal. In Experiment II, we evaluated the subjective qualities of sinusoidal vibrations with different frequencies via adjective rating. Thirteen adjective pairs were carefully selected, and rated for the sinusoidal vibrations played through the mobile device. The results were regressed to the Perceptual Space, revealing several adjective pairs that can largely account for the distributions of vibration points in the Perceptual Space, such as ‘dark-bright,’ ‘dull-clear,’ ‘slow-fast,’ ‘vague-distinct,’ ‘thick-thin,’ and ‘heavy-light.’ The findings of this paper can help understand the Perceptual characteristics and subjective impressions of mobile device vibrations.
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HAPTICS - Perceptual Space and adjective rating of sinusoidal vibrations perceived via mobile device
2010 IEEE Haptics Symposium, 2010Co-Authors: Inwook Hwang, Seungmoon ChoiAbstract:In the past five years, how to utilize the haptics technology in the mobile device to improve its limited user interface has emerged as an attractive research topic. In this paper, we report two kinds of Perceptual data related to vibrotactile signals perceived through a mobile device held in the hand. In Experiment I, we estimated Perceptual dissimilarities between sinusoidal vibrations with seven frequencies in 40–250 Hz and two amplitudes of 30 and 40 dB SL. Multi-dimensional scaling was then applied to the Perceptual distances, and led to a two-dimensional Perceptual Space. In the Perceptual Space, the vibrations of the two amplitudes formed distinct groups. The two groups showed similar structures with respect to the frequency variation. In particular, two Perceptual dimensions that spanned a low frequency range (40–100 Hz) and a high frequency range (100–250 Hz) were close to be orthogonal. In Experiment II, we evaluated the subjective qualities of sinusoidal vibrations with different frequencies via adjective rating. Thirteen adjective pairs were carefully selected, and rated for the sinusoidal vibrations played through the mobile device. The results were regressed to the Perceptual Space, revealing several adjective pairs that can largely account for the distributions of vibration points in the Perceptual Space, such as ‘dark-bright,’ ‘dull-clear,’ ‘slow-fast,’ ‘vague-distinct,’ ‘thick-thin,’ and ‘heavy-light.’ The findings of this paper can help understand the Perceptual characteristics and subjective impressions of mobile device vibrations.
Maki Sakamoto - One of the best experts on this subject based on the ideXlab platform.
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Visualizing Individual Perceptual Differences Using Intuitive Word-Based Input.
Frontiers in psychology, 2019Co-Authors: Maki Sakamoto, Junji WatanabeAbstract:Numerous studies have investigated the fundamental dimensions of human tactile Perceptual Space using a wide range of materials. Participants generally touch materials and quantitatively evaluate variations in tactile sensations for pairs of adjectives pertaining to the material properties, such as smooth-rough and soft-hard. Thus, observers evaluate their Perceptual experiences one by one in terms of adjective pairs. We previously proposed an alternative method of qualitative evaluation of tactile sensations. Our system can automatically estimate ratings of fundamental tactile properties from single sound-symbolic words. We were able to construct a word-based Perceptual Space by collecting words that express tactile sensations and applying them to the system. However, to explore individual differences in Perceptual Spaces, different databases for converting words into ratings of adjective pairs are required for each individual. To address this, in the present study we created an application that can automatically generate an individualized Perceptual Space by moving only a few words in the initial word-based Perceptual Space. In addition, we evaluated the efficacy of the application by comparing the tactile Perceptual Space before and after use.
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automatic estimation of multidimensional ratings from a single sound symbolic word and word based visualization of tactile Perceptual Space
IEEE Transactions on Haptics, 2017Co-Authors: Ryuichi Doizaki, Junji Watanabe, Maki SakamotoAbstract:Several pairs of Japanese adjective words pertaining to material's properties, such as roughness and hardness, have been used in Japanese studies to quantitatively evaluate variations in tactile sensations. This method asks observers to analyze their Perceptual experiences one by one. An alternative notion is that human Perceptual recognition is performed as a whole rather than by using fragmented factors. Based on this notion, we propose a system that can automatically estimate multidimensional ratings of touch from a single sound-symbolic word that has been spontaneously and intuitively expressed by a user. When a user inputs a sound-symbolic word into the system, the system refers to a database of phonemes and their auditory impressions, and calculates ratings in terms of 26 pairs of fundamental scales of touch. The estimated ratings of sound-symbolic words enable us to visualize a tactile Perceptual Space. Our study provides an alternative method for estimating the fine quality of tactile sensations.
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AAAI Spring Symposia - A System to Visualize Tactile Perceptual Space of Young and Old People
2016Co-Authors: Mai Kosahara, Junji Watanabe, Yasuaki Hiranuma, Ryuichi Doizaki, Takahide Matsuda, Maki SakamotoAbstract:Sound symbolic words are known to exhibit synesthetic associations between sounds and sensory experience. We constructed a system that visualizes the relationship between sound symbolic words and standardized tactile materials on the tactile Perceptual Space map. The system enables us to compare the affective tactile evaluations of young people with old people.