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Article type: Cover
Pages Cover1-
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (13K) -
Article type: Index
Pages Toc1-
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (83K) -
Masataka ISHIGAKI, Tetsuto MINAMI, Shigeki NAKAUCHIArticle type: Article
Session ID: HI2008-114/CE2008-74
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe investigated the effects of face (eye-spacing) adaptation on event-related potentials (ERPs) during a visual oddball task. We measured ERPs during a oddball task using face stimuli after the adaptation to stimuli with increased or decreased eye-spacing As a result, the adaptation affected the width of eye-spacing natural and also changed the P300 amplitude. Our findings suggest that the neural effects of the face adaptation are reflected in the P300 component.View full abstractDownload PDF (963K) -
Kimiko GOTO, Tetsuto MINAMI, Nobuko KOMORI, Yohko SHIMADA, Yasuhiro KA ...Article type: Article
Session ID: HI2008-115/CE2008-75
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSFace perception is important for our social interaction. When we perceive faces, not only face features such as its configuration and contour but also face color might affect our face perception. This study aimed to reveal the effect of the color information on face processing and consider its developmental aspects. For this purpose, an event-related potential (ERP) was measured while a natural or blue color face was presented to adults (N=10, mean age of 25.4 years) and infants (N=14, mean age of 245 days). As a result, the amplitude of the ERP (adult N170 and infant N290) which deeply correlates with face processing tended to be larger in response to a blue color face than in response to a natural color face. The result indicates that the color information effects on face processing in similar way with face configuration and that face color might also play important roles in the processing not only for adults but also for infants.View full abstractDownload PDF (877K) -
Hideaki TOUYAMA, Michitaka HIROSEArticle type: Article
Session ID: HI2008-116/CE2008-76
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, a technique of photo retrieval / indexing using human brain activities is presented. The non-invasive electroencephalogram (EEG) recording was applied to have event-related P300 evoked potential during photo retrieval task in oddball paradigm. Three subjects tried to select the photo images among nine that they want to pickup according to their mental states. The features of the P300 evoked potential were successfully extracted from temporal average EEG signals. It was found that the average performances of target photo selections reached more than 80% using three-channel EEG activities with four-time average. This concept will be applicable in future to achieve intuitive retrieval and indexing for life log with large quantities of data.View full abstractDownload PDF (396K) -
Junya FUJISAWA, Hideaki TOUYAMA, Michitaka HIROSEArticle type: Article
Session ID: HI2008-117/CE2008-77
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, alpha band modulation during visuo-spatial attention without flickering visual stimuli was focused. Visual spatial attention has been expected to provide a new channel of noninvasive independent brain computer interface (BCI), but little work has been done on the new interfacing method. The flickering stimuli used in previous work cause a decline of independency and have difficulties in a practical use. Therefore we investigated whether visual spatial attention could be detected without such stimuli. The common spatial patterns (CSP) were for the first time applied to the brain states during visual spatial attention. The performance evaluation was based on three brain states of left, right and center direction attention. The 30-channel scalp electroencephalographic (EEG) signals over occipital cortex were recorded for five subjects. The averaged classification accuracy was 75.39 (range 63.75 to 86.13)% for left vs right direction attention. It is suggested that CSP is useful in the context of visual spatial attention, and the alpha band modulation during visual spatial attention without flickering stimuli has the possibility of a new channel for independent BCI as well as ERD/ERS in motor imagery.View full abstractDownload PDF (555K) -
Yasuto Tanaka, Takeshi Nogai, Shinji MunetsunaArticle type: Article
Session ID: HI2008-118/CE2008-78
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSTo elucidate time perception using auditory and visual information, a temporal order judgment task was employed using a pip auditory signal and a Gabor visual signal. Timing was manipulated by changing onset asynchrony of the auditory and visual signals. Participants were asked which of visual or auditory signals were perceived to come earlier or simultaneous (1) when the visual and auditory signals were presented simultaneously, (2) when the auditory signal was presented prior to the visual signal, and (3) when the visual signal was presented prior to the auditory signal. The participants reported simultaneity by 96% when the visual and auditory signals were presented on time. They reported that auditory signal came faster by 92% when the auditory signal onset came earlier. However, they reported simultaneity by 75% when the visual signal onset came earlier up to 200ms onset asynchrony. This discrepancy of simultaneity between visual and auditory signal onset may be due to different processing time of the brain for visual and auditory signals that affects the process of cross-modal events.View full abstractDownload PDF (402K) -
Takahiro KAWABEArticle type: Article
Session ID: HI2008-119/CE2008-79
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWhen sequential visual flashes are accompanied by either a lower or greater number of sequential auditory pulses, the perceived number of visual flashes is actually lower or greater than the actual number. These responses are termed 'flash fusion' or 'sound-induced flash illusion', respectively. Although the neural correlates and mathematical model for these illusions have been previously described, the specific underlying mechanisms are unknown. This study examined whether flash fusion occurs by top-down and bottom-up temporal captures of vision by audition. A unique flash with a luminance increment was used, and observers reported which 'illusory' flashes was the unique flash with the luminance increment. The unique flash was generally captured by the pulse in the temporal vicinity, suggesting a bottom-up temporal capture. However, when an auditory pulse was given a unique pitch, the unique flash was perceptually paired with the unique pitch, suggesting a feature-based temporal capture. Moreover, the pairing of audiovisual features disappeared when the temporal location of the unique pitch was difficult for the observer to anticipate. These data indicate that flash fusion is a consequence of both the top-down feature-based temporal capture and the bottom-up temporal capture.View full abstractDownload PDF (967K) -
Kohske TAKAHASHI, Katsumi WATANABEArticle type: Article
Session ID: HI2008-120/CE2008-80
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSPerception of ambiguous visual patterns changes stochastically from one percept to the other. It was recently shown that auditory and tactile stimulation affect perceptual alternation in vision, suggesting that perceptual alternation is not always a uni-modal phenomenon. In the present study, we investigated how cross-modal interaction affects the temporal characteristics of perceptual alternation in vision. The participants observed and reported if two dots in an ambiguous visual pattern appeared to be moving horizontally or vertically. In addition, task-irrelevant visual or auditory background stimuli were present at either random or non-random temporal interval. The participants were explicitly told not to attend the background stimuli. In the random condition, both the audio and the visual stimuli often induced an immediate perceptual alternation of the bi-stable pattern. No effect was found in the non-random condition. In addition, there was a correlation between the magnitude of the effect of the visual and the auditory background stimuli, i.e. participants that were highly influenced by the visual stimuli were also highly influenced by the auditory stimuli. The influence of the background stimuli was independent of the natural or spontaneous frequency of perceptual shift, i.e. participants that had a low frequency of spontaneous perceptual alternation could still be influenced by the visual and the auditory background stimuli. These results suggested that: (1) ignored stimuli, if random and therefore unpredictable, reduce perceptual stability, (2) perceptual destabilization is caused by supra-modal processing, and (3) perceptual destabilization is independent from sensory specific processes which generates spontaneous perceptual alternation.View full abstractDownload PDF (1003K) -
Shinsuke SHIMOJOArticle type: Article
Session ID: HI2008-121/CE2008-81
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (133K) -
Masahito NAGATA, Katsunori OKAJMA, Masayuki OSUMIArticle type: Article
Session ID: HI2008-122/CE2008-82
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe mechanism of gloss perception has been unclear and thus the perceived glossiness doesn't always correspond to the physically-measured glossiness. In the present report, we show that glossy specular component is isolated from the reconstructed shape by means of the second-order derivative value on luminance distribution in our visual system.View full abstractDownload PDF (658K) -
Toshikazu MATSUIArticle type: Article
Session ID: HI2008-123/CE2008-83
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIt has been computationally clarified how the image observation characteristics influence the sharpness evaluation function in human vision. This is accomplished by using a sharpness evaluation method based on the cooperative human vision model with image observation characteristics similar to those in human vision and examining the effect of the model's image observing mechanism on the model's sharpness metric performance. Evaluated images were continuous-tone generalized knife-edge images and their digital halftone images. Consequently, the following results were obtained: (1) The vision model reproduced accommodation characteristics during subjective sharpness evaluation; (2) the sharpness evaluation metric with the image observing mechanism was superior in evaluation performance to the metric without it. These results suggest that the adaptive change in the image observation characteristic for evaluated images prevents the evaluation performance from deteriorating according to evaluation conditions and furthermore a similar phenomenon can occur in the sharpness evaluation process in human vision.View full abstractDownload PDF (1144K) -
Toshifumi MIHASHI, Mariko KOBAYASHI, Yoko HIROHARA, Takashi FUJIKADOArticle type: Article
Session ID: HI2008-124/CE2008-84
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe have developed a binocular open-view Shack-Hartmann wavefront sensor. It can measure fluctuation of wavefront aberration while a subject is observing a visual stimulus, so we can perform objective and subjective measurements simultaneously. We performed objective wavefront sensing and subjective luminance contrast sensitivity measurement simultaneously and compared those results to investigate if the contrast sensitivity decrease when the aberrations increase..View full abstractDownload PDF (562K) -
Akihiro FUJIMURA, Masao OHMIArticle type: Article
Session ID: HI2008-125/CE2008-85
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe purpose of this research is to make the factor of progress of performance technology including the consciousness of the rhythm clear from the difference in brain activity. An experiment cooperator's being spontaneous or the brain activity at the time of performing the natural handclap united with the atmosphere of the musical piece and the handclap specified by the experimenter side was measured with optical topography equipment to the musical piece. Doing a result and voluntary clapping tended for the activation of the brain activity to be seen from directed clapping.View full abstractDownload PDF (557K) -
Masato Nunoi, Sakiko YoshikawaArticle type: Article
Session ID: HI2008-126/CE2008-86
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThere seems to be a relationship between liking an object and exposure experiences to it. Previous studies have given special attention to the relationship between liking and the mere exposure experiences. Contrarily, in this study, we have focused only on exposure experiences with intention. In our experiments, we manipulated the levels of processing and the number of times the objects were processed and tested their effects on the development of liking for objects. The results showed that the deeply processed objects were liked more than objects that were processed superficially, and the objects processed five times were liked more than the objects that were processed only once. Moreover, these effects could still be observed 1day and even 1week after the objects were first processed.View full abstractDownload PDF (716K) -
Takafumi SASAOKAArticle type: Article
Session ID: HI2008-127/CE2008-87
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIt has been suggested that active exploration of views of 3-D objects facilitates subsequent object recognition. In the present study, the effectiveness of this facilitation was evaluated for various conditions of active exploration. Significant improvement in object recognition performance was observed when the rotation axis of the subject's hand was aligned with the object's rotation axis during active exploration. Moreover, the magnitude of this improvement was not symmetric with respect to the plus-minus direction of rotation. However, this asymmetry was not observed when the rotational axes of the hand and of the object were not aligned. These results imply that hand movement plays an important role in facilitating object recognition by active exploration, and that the motor system is involved in this facilitation.View full abstractDownload PDF (972K) -
Yukihisa MATSUDA, Syoichi IWASAKIArticle type: Article
Session ID: HI2008-128/CE2008-88
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSSpatial cueing method believed to reflect for the spatial property of attention (Posner, 1978, 1980). Attention is captured by the cue automatically or mandatorlly. Attention that is captured and allocated at the cued position, is believed to facilitate information processing. Although, the original account for the facilitation effect called attentional capture has thought to be absolutely correct, results in our research and re-analyses of other papers showed that the original account should be incorrect. These results are not congruent with the idea what spatial cueing method facilitated a stimulus presented at the processing of the cued location.View full abstractDownload PDF (841K) -
Souhei KOMORI, Masahiro ISHII, Zheng TANG, Kazuya YAMASITA, Masayuki S ...Article type: Article
Session ID: HI2008-129/CE2008-89
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe perceived slant from binocular disparity, motion parallax, or pictorial cue is similar to the geometrical prediction. The apparent shape induced by slant from binocular disparity, motion parallax, or pictorial cue, however, is not well-established. The present research investigated the perceived slant and shape simultaneously. The results indicate that the perceived shape deformation is smaller than the prediction.View full abstractDownload PDF (853K) -
Ryota KAWAGATA, Masahiro ISHII, Zheng TANG, Kazuya YAMASHITAArticle type: Article
Session ID: HI2008-130/CE2008-90
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis research investigates if the factor of proximity affects the perception of bistable apparent motion stimulus for which either a motion on frontal planes or a motion in depth can be perceived. The stimulus, which is a dynamic random-dot stereogram, was displayed on a stereoscope. When the distance of the motion on the frontal plane was kept the same, shorter distance in depth resulted in perceived motion on the frontal plane, and longer distance lead to perceived motion in depth.View full abstractDownload PDF (768K) -
Masayuki SATO, Keiji UCHIKAWAArticle type: Article
Session ID: HI2008-131/CE2008-91
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSTo examine influences of selective spatial attention on stereopsis, we compared disparity thresholds obtained in the following four experimental conditions. In the center-only condition, the disparity-defined target was presented at 2° eccentricity. In the periphery-only condition, the target was presented at 10° eccentricity, hi the center-priority condition, the central and peripheral targets were presented simultaneously while the observer paid more attention to the central target. In the periphery-priority condition, more attention was paid to the peripheral target. The results showed that threshold elevation occurred almost exclusively for the less attended targets, and that magnitudes of threshold elevation were in up to 1 log-unit range. It appears that the effective visual field for stereopsis is relatively small and that processing disparity needs focused attention.View full abstractDownload PDF (573K) -
Article type: Appendix
Pages App1-
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (76K) -
Article type: Appendix
Pages App2-
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (76K) -
Article type: Appendix
Pages App3-
Published: November 07, 2008
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (76K)
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