Kazuhiko Yokosawa

Kazuhiko Yokosawa
The University of Tokyo | Todai · Division of Psychology and Sociology

PhD

About

224
Publications
20,473
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
892
Citations
Introduction
Additional affiliations
January 2002 - December 2012
The University of Tokyo

Publications

Publications (224)
Article
Temporal ventriloquism refers to the shift in the perceived timing of a visual stimulus towards a transient auditory stimulus presented close in time. This effect is demonstrated by greater sensitivity of temporal order judgments of two visual stimuli when a sound is presented before the first visual stimulus and after the second visual stimulus. R...
Article
The space surrounding the body in which individuals interact with the environment is known as the peripersonal space (PPS). Previous studies have reported that PPS has multisensory nature. However, the relationship between the multisensory nature of PPS and an individuals’ defensive actions has not been fully clarified to date. We investigated this...
Article
Full-text available
Distance perception in humans can be affected by oculomotor and optical cues and a person’s action capability in a given environment, known as action-specific effects. For example, a previous study has demonstrated that egocentric distance estimation to a target is affected by the width of a transparent barrier placed in the intermediate space betw...
Article
Full-text available
People react faster to visuo-tactile stimuli presented near the body (i.e., in peripersonal space) than to tactile stimuli presented alone. This multi-sensory facilitation effect has been used as a measurement of peripersonal space. Previous research has reported that peripersonal space representations can be modulated by actively using hand-held t...
Article
Full-text available
Grapheme-color synesthetes experience graphemes as having a consistent color (e.g., “N is turquoise”). Synesthetes’ specific associations (which letter is which color) are often influenced by linguistic properties such as phonetic similarity, color terms (“Y is yellow”), and semantic associations (“D is for dog and dogs are brown”). However, most s...
Article
The space surrounding our body is called peripersonal space (PPS). It has been reported that visuo-tactile facilitation occurs more strongly within PPS than outside PPS. Furthermore, previous research has revealed several methods by which PPS can be extended. The present study provides the first behavioral evidence of the transfer of PPS in a virtu...
Article
Humans can perceive a coherent visual scene despite a low spatial resolution in peripheral vision. How does the visual system determine whether an object exists in the periphery? We addressed this question by focusing on the extinction illusion in which a disk becomes subjectively invisible when presented at the intersection of grids. We hypothesiz...
Article
Grapheme-color synesthesia is a condition in which the visual perception of letters or numbers induces a specific color sensation. The consistency of grapheme-color association has been considered as a fundamental characteristic of synesthesia. However, recent studies have indicated that this association can change across the adult lifespan, and it...
Preprint
Audiovisual temporal recalibration refers to a shift in the point of subjective simultaneity (PSS) between audio and visual signals triggered by prolonged exposure to asynchronies between these signals. Previous research indicated that the spatial proximity of audiovisual signals can be a determinant of which pairs of signals are temporally recalib...
Preprint
The space surrounding our body is called peripersonal space (PPS). It has been reported that visuo-tactile facilitation occurs more strongly within PPS than outside PPS. Furthermore, previous research has revealed several methods by which PPS can be extended. The present study provides the first behavioral evidence of the transfer of PPS in a virtu...
Preprint
Grapheme-color synesthetes experience graphemes as having a consistent color (e.g., “N is turquoise”). Synesthetes’ specific associations (which letter is which color) are influenced by linguistic properties (letter frequency, phonetic similarity, etc.), and plausibly reveal the characteristics of underlying letter representations. Despite their cl...
Article
Full-text available
Several studies have shown that space immediately surrounding the body, or the peripersonal space is represented differently in the brain from the more distant extra-personal space. Moreover, the boundary of peripersonal space can be extended to space surrounding the tip of a tool held by the hand. However, it is not known if tools need to be conne...
Article
Full-text available
Grapheme-colour synaesthesia is a condition in which the visual perception of letters or numbers induces a specific colour sensation. In this study, we demonstrated that the apparent physical brightness of graphemes is modulated by the synaesthetic colours elicited by them. Synaesthetes first selected a synaesthetic colour corresponding to each cap...
Article
Full-text available
Previous research suggests that the size of one’s body is used as a metric to scale the external world. On the other hand, the influence of information from the external world on the perception of body size is unclear. It has been suggested that increased inter-pupillary distance (IPD) leads people to perceive the external world as smaller than it...
Article
Full-text available
Synesthesia is a condition in which the perception of a stimulus in one modality automatically triggers a secondary sensation in another modality or processing stream. Our study focused on grapheme-color synesthesia, in which the visual perception of letters or numbers (graphemes) induces a specific color sensation (the synesthetic color). Grapheme...
Article
One of the fundamental questions about grapheme–colour synaesthesia is how specific associations between the graphemes and colours are formed. We addressed this question by focusing on the determinants of synaesthetic colours for Japanese Kanji characters (logographic characters) using a psycholinguistic approach. Study 1 explored the influence mea...
Article
In previous studies of image evaluation using wide color gamut displays, it is unclear to what degree people prefer the chroma‐varying images, especially the images that are more saturated than the most preferred image. Here, we present a study using a wide color gamut display, which measured viewers' most preferred level of image chroma (experimen...
Article
Full-text available
Grapheme-color synesthesia is a condition in which visual letters or characters induce a specific color sensation. It has been suggested that a range of linguistic properties influence synesthetic grapheme-color correspondence, but the influence of graphemic (orthographic) information is not well understood. In this experiment, synesthetes chose up...
Article
Full-text available
Children often personify non-living objects, such as puppets and stars. This attribution is considered a healthy phenomenon, which can simulate social exchange and enhance children's understanding of social relationships. In this study, we considered that the tendency of children to engage in personification could potentially be observed in abstrac...
Article
Full-text available
Counting is characterized as a slow and error-prone action relying heavily on serial allocation of focused attention. However, quick and accurate counting is required for many real-world tasks (e.g., counting heads to ensure everyone is evacuated to a safe place in an emergency). Previous research suggests that task-irrelevant spatial dividers, whi...
Article
To investigate the effect of continuous focused attention on change detection, Nakashima & Yokosawa (2018) conducted a single object change detection task, manipulating blank durations and locations of study and test images (same/different). They suggested that attention can focus on a local area during a brief blank period, and that continuous foc...
Article
Grapheme-color synesthesia is a neurological phenomenon in which viewing a grapheme elicits an additional, automatic, and consistent sensation of color. Color-to-letter associations in synesthesia are interesting in their own right, but also offer an opportunity to examine relationships between visual, acoustic, and semantic aspects of language. Re...
Article
Full-text available
What is the role of continuously focused attention on an object in change detection? To ensure focused attention on one object, we conducted a single object change detection task, manipulating an object’s location between pre-change and post-change displays (same or different location), and also manipulating a blank duration (the FOD task) and a pr...
Article
Visual search is supported by various components. Inhibition of return (IOR) is a mechanism by which orienting to a previously attended location or object is inhibited. In two experiments, we examined whether categories of real-life objects modify IOR. In Experiment 1, familiar objects (faces, hands, feet, chairs, and flowers) and a nonsense contro...
Article
Full-text available
A three-quarter view, i.e., an oblique view, of familiar objects often leads to a higher subjective goodness rating when compared with other orientations. What is the source of the high goodness for oblique views? First, we confirmed that object recognition performance was also best for oblique views around 30° view, even when the foreshortening di...
Data
Examples of the sequential presentation. First, SOA 500 ms condition (i.e., practice-session-“slow” session) and then SOA 100 ms condition (i.e., experimental session).
Article
Full-text available
Although viewing multiple stacks of medical images presented on a display is a relatively new but useful medical task, little is known about this task. Particularly, it is unclear how radiologists search for lesions in this type of image reading. When viewing cluttered and dynamic displays, continuous motion itself does not capture attention. Thus,...
Article
Grapheme-color synesthesia is a condition in which a visual letter or character induces a specific color sensation. Although grapheme-color association in grapheme-color synesthesia is characterized as idiosyncratic, some regularities in synesthetic sensation have also been reported. For example, Asano and Yokosawa (2012) showed that sound and mean...
Article
When a sensory feature itself is too ambiguous to judge its magnitude, we can interpret it by relying on prior knowledge; co-occurrence relation with other sensory features. For example, if one must judge the brightness of outdoor illumination (bright versus dark), the subjective brightness of illumination is very ambiguous. Depending upon co-occur...
Article
Full-text available
Previous studies have focused on the differences in the art appreciation process between individuals, and indicated that novice viewers of artworks, in comparison to experts, rarely consider the creation process of the artwork or how this may relate to style. However, behavioral changes in individuals after educational interventions have not been e...
Article
Full-text available
Temporal phase discrimination is a useful psychophysical task to evaluate how sensory signals, synchronously detected in parallel, are perceptually bound by human observers. In this task two stimulus sequences synchronously alternate between two states (say, A-B-A-B and X-Y-X-Y) in either of two temporal phases (ie A and B are respectively paired w...
Article
We can infer a voice of an unfamiliar person from his/her face. One hypothesis attributes this to common information conveyed by voices and faces. However, the nature of this critical information remains unclear (Mavica & Barenholz, 2013). Some recent reports have shown that auditory and visual stimuli, which do not have any direct relations (e.g....
Article
Grapheme-color synesthesia is a condition in which a visual letter or character induces a specific color sensation. By taking advantage of special characteristics of the Japanese language, we have revealed involvement of several linguistic properties of graphemes (e.g., phonology, orthographical shape, meaning or concepts) in determining grapheme-c...
Article
Cross-modal correspondences are tendencies to match co-occurring features across sensory modalities that stem from statistical relations of co-occurring features in daily experience (Spence, 2011). Previous studies have demonstrated that a novel one-to-one correspondence between different sensory features can be acquired through perceptual learning...
Article
Full-text available
We investigated cultural differences between U.S. and Japanese color preferences and the ecological factors that might influence them. Japanese and U.S. color preferences have both similarities (e.g., peaks around blue, troughs around dark-yellow, and preferences for saturated colors) and differences (Japanese participants like darker colors less t...
Article
Full-text available
The human face and gaze direction elicit explicit attention in terms of the fixations that guide selective attention to visual information. We examine this possibility by tracking eye movements while participants twice viewed a video of a magic trick and demonstrate that participants fixate on the magician's face. During the first viewing, particip...
Article
Full-text available
Associations between graphemes and colours in a nonsynaesthetic Japanese population were investigated. Participants chose the most suitable colour from 11 basic colour terms for each of 40 graphemes from the four categories of graphemes used in the Japanese language (kana characters, English alphabet letters, and Arabic and kanji numerals). This te...
Article
Full-text available
Previous studies of change blindness have examined the effect of temporal factors (e.g., blank duration) on attention in change detection. This study examined the effect of spatial factors (i.e., whether the locations of original and changed objects are the same or different) on attention in change detection, using a shift-contingent change blindne...
Article
Full-text available
Traditional research on the scene consistency effect only used clearly recognizable object stimuli to show mutually interactive context effects for both the object and background components on scene perception (Davenport & Potter in Psychological Science, 15, 559-564, 2004). However, in real environments, objects are viewed from multiple viewpoints...
Article
Full-text available
How does domain-specific knowledge influence the experts' performance in their domain of expertise? Specifically, can visual search experts find, with uniform efficiency, any type of target in their domain of expertise? We examined whether acquired knowledge of target importance influences an expert's visual search performance. In some professional...
Article
Full-text available
Recent research on human perception is selectively reviewed with a focus on emer- ging issues in cognitive science and cognitive psychology. An important new approach to perception is identified that emphasizes integrated processes involving relationships among different features extracted from multiple modalities. We propose this new approach term...