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Displaying 1-24 of 24 articles from this issue
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Article type: Cover
Pages Cover1-
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (12K) -
Article type: Index
Pages Toc1-
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (75K) -
Kenzo SAKURAI, Toshio KUBODERA, Philip M. GROVE, Shuichi SAKAMOTO, Yoi ...Article type: Article
Session ID: HI2011-74
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSPreviously, we reported that upright observers, experiencing real leftward/rightward or forward/backward body motion while viewing orthogonal translating or expanding/contracting optic-flow, perceived self-motion directions intermediate to those specified by visual and vestibular information (Sakurai et al, 2010, Journal of Vision, 10(7): 866). Here we investigate conditions in which observers lay supinely, experiencing real upward/downward or leftward/rightward motion in body coordinates, while viewing orthogonal optic-flow patterns, phase-locked to the swing motion. Optic-flow patterns consisted of leftward/rightward or upward/downward translational or expanding/contracting oscillatory optic-flow. Observers were cued with a sound to indicate their perceived direction of self-motion, via a rod-pointing task. When upward/downward or leftward/rightward body motion was combined with visual leftward/rightward or upward/downward optic-flow, most observers' direction judgments progressively favored the direction specified by vision with increasing amplitude of optic-flow, as in our previous reports, suggesting a weighted combination of visual and vestibular cues in this context. For combinations of body motion with visual expanding/contracting optic-flow, some observers' judgments were vision-only or vestibular-only, suggesting that multimodal integration in this context is an either-or process for these observers. Compared to our previous reports, one possible reason for this weighted combination failure is the discrepancy between body coordinates and gravity coordinates.View full abstractDownload PDF (739K) -
Takanori CHIHARA, Kyoko HIGURASHI, Keiko KASAMATSUArticle type: Article
Session ID: HI2011-75
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSConsumers may take it in their hand and check material and texture, when they purchase a product. It is thought that a product was taken in their hand on the basis of a form, a texture, and a size, etc., while various products were located in a line. Human beings have desire to touch actively to a product. We focused on the shape of product in this study. The quantitive relation between a shape and the psychological quantity was examined.View full abstractDownload PDF (477K) -
Kuniharu SUZUKI, Katsunori OKAJIMAArticle type: Article
Session ID: HI2011-76
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe investigated experimentally the characteristics of the dynamic texture produced by visual motion and tactile information. Specifically, 1) we examined the influence of vision and tactile on perception of the hardness, using visual stimulation which we can deform actively and in real time by tactile and 2) when we can deform visual stimuli with a variety of texture by tactile, we examined influence of the texture on perception of hardness. Results suggested that visual motion information significantly influences the hardness perception mechanism and that visual information made us feel stimuli softer in comparison with tactile information.View full abstractDownload PDF (875K) -
Masato SEKINE, Katsuhiko OGAWAArticle type: Article
Session ID: HI2011-77
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe analyzed a correlation between time series characteristics (spectrum) of frame difference in motion graphics and subjective impressions containing "complexity", "intensity", "sustainability of interest" and "comfort". As a result, it suggests that "complexity" and "sustainability of interest" tend to be higher when the time series has 2 sec or longer cycle combined with 240-700msec cycle, and 240-700msec cycle has strong effect on "sustainability of interest". Besides "intensity" tends to be higher when the time series has 700msec〜1.7sec cycle and high energy of total spectrum.View full abstractDownload PDF (586K) -
Sei-ichi TSUJIMURA, Tomoya UEZONOArticle type: Article
Session ID: HI2011-78
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA recent study has shown that retinal ganglion cells containing the photopigment melanopsin, which are intrinsically photosensitive in primates, project to the pupillary control center in the pretectum. The aim of this study was to investigate how signals driven by melanopsin-containing retinal ganglion cells (mRGCs) and cone-mediated color signals contribute to the pupillary control mechanism. A four-primary illumination system that enables isolated stimulation of mRGCs was used to control stimulation of the three cone types and mRGCs independently in the human eye. It was found that the transient pupillary response to mRGC stimuli has a longer latency than that to color stimuli.View full abstractDownload PDF (411K) -
Shoji SUNAGA, Tomomi OGURA, Takeharu SENO, Masayuki SATOArticle type: Article
Session ID: HI2011-79
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe investigated the validity of dichromatic simulation by using a visual search task. Reaction time of the dichromatic simulated color stimulus for the trichromatic observers was qualitatively similar to those of the original color stimulus for the deuteranomalous observers. However, reaction times for the deuteranomalous observers tended to be longer than those for the trichromatic observers. We proposed a modified dichromatic simulation with reduction of the excitation purity and tested our model.View full abstractDownload PDF (590K) -
Taka HATTORI, Yasuki YAMAUCHIArticle type: Article
Session ID: HI2011-80
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, we investigated the effects of the surrounding stimuli on the color memory of dichromats using successive color discriminating experiments. In the experiment, we measured the detection threshold of the color shift from the reference for two subject groups: dichromats and trichromats. We adopted two different conditions: no-surrounding color (uniform fray background) and 8 iso-luminance colors. We discuss the effects of the surround stimuli on color memory by comparing the thresholds of Δa^* and Δb^* obtained from two subject groups.View full abstractDownload PDF (714K) -
Hirotoshi NISHITA, Kazuho FUKUDA, Keiji UCHIKAWA, Tatsuya YOSHIZAWA, H ...Article type: Article
Session ID: HI2011-81
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIt is reported that dichromats can categorize colors like trichromats, though they have colors that they can not discriminate because they suffered a loss in one kind of cone. However it is reported that dichromats can not categorize color like dichromats in limited presentation condition. In this study, we examined the changes in regional cerebral blood volume (rCBV) around visual cortex using Near Infrared Spectroscopy (NIRS) when dichromats and trichromats do color naming task, for examining whether cortical activation are different from dichromats and trichromats, and that of dichromats are different from when they can categorize colors like trichromats and when they can not. The result showed interaction between dichromats/trichromats and presentation condition, and significant Oxy-Hb increment when dichromats can categorize colors like trichromats than when they can not.View full abstractDownload PDF (667K) -
Haruyuki KOJIMAArticle type: Article
Session ID: HI2011-82
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIt is well-known that language processing is lateralized in left cerebral hemispheres while spatial processing in right. We investigated whether simple object perceptual process was lateralized or not with behavioral tasks while monitoring activation of occipital cortex using Near Infrared spectroscopy (NIRS). Object words, object line drawings and meaningless line drawings were prepared for stimuli. A stimulus was presented firstly at the center and then successively either in left or right visual hemi-field (LVF, RVF). Subjects judged whether the two drawings/words were the same or not. In word and meaningless object judgment, oxy-hemoglobin concentration increased in broader area in both hemispheres with LVF than RVF. In line drawing judgment, more activation was observed in both hemispheres with RVF than LVF. This result indicates that cortical function starts lateralizing at an early stage of visual perception.View full abstractDownload PDF (674K) -
JuHyun LEE, Katsuaki SAKATAArticle type: Article
Session ID: HI2011-83
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSSynesthetic color perception should be interacted somewhere in the usual processing stream in visual pathway. We could assume in which stage of sensory-perceptual processing synesthesia might be evoked. Thus, by comparing synesthesia types with different sensory aspects but with common synesthetic colors, this study aims to identify in which level of sensory-perceptual processing synesthesia occurs by using various types of stimuli. 2 Subjects who experience synesthetic color in common were presented with 2 types of stimuli respectively. In the case of grapheme-colored synesthesia MA, the result reveals that grapheme-colored synesthesia is influenced by both the low level perception and the high level perception. In colored-hearing syneathesia subject TD, a perception as music rather than recognition of physical aspects of sound stimuli, has a stronger influence on synesthesia, and therefore, it could be inferred that higher level perceptional factors are involved. Since grapheme-colored synesthesia is considered a projector and colored-hearing synesthesia is considered an associator, levels of occurrence where synesthesia are produced might have been different.View full abstractDownload PDF (592K) -
Ichiro KURIKI, Shingo NAKAMURA, Renjun MIAO, Rumi TOKUNAGA, Kazumichi ...Article type: Article
Session ID: HI2011-84
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSVisual feature information such as motion, shape, color, and etc. are known to be processed at localized visual areas. Since we perceive unified features from one object, e.g, color and motion, the integration of those signals might take place somewhere in the visual system. The present study made attempts to track the separation and binding processes of visual feature signals by the analysis of brain activities measured by functional MRI technique.View full abstractDownload PDF (667K) -
Takahiro MARUYAMA, Masayuki KIKUCHIArticle type: Article
Session ID: HI2011-85
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSRecently, a lot of interests have been focused on Brain-Computer Interface (BCI), which attempts to connect human brain and computers in order to detect cognition or thinking in the brain. In previous studies, subjects had to bear various loads such as being hold in a huge measuring devices or taking time to attach a lot of electrodes on a skin of the head. In this study, we constructed a BCI system which discriminates left or right in subject's mind by a simple 2ch NIRS. We prepared various stimuli patterns foe the experiments, and measured the correct rates of the discrimination for them attained by the proposed system. As a result, we obtained the average correct rates over 70%. We were able to show from the results that it is possible to execute such task for BCI by a simplified NIRS.View full abstractDownload PDF (650K) -
Suguru SAITO, Zhongxiang ZHENGArticle type: Article
Session ID: HI2011-86
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSShadow mapping is an efficient method to generate visual shadow effect in realtime computer graphics, and has broad variation. We introduce a new improved method of shadow mapping, which generates more accurate soft shadows with a low calculation cost. We also show the efficiency of our soft shadowing method in case that small self shadows are happened where bumpy surfaces are lit.View full abstractDownload PDF (3374K) -
Keiji UCUIKAWAArticle type: Article
Session ID: HI2011-87
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSColor constancy is a color vision ability, with which we can perceive colors of surfaces under different illuminants as constant. To accomplish color constancy the illuminant color needs to be discounted from the light reflected from surfaces. Some strategies for discounting the illuminant color use statistics of luminance and chromaticity distribution in natural scenes. Gray-World hypothesis is a typical framework of this sort of strategies. Golz and MacLeod (2002) showed that the luminance-chromaticity correlation of surfaces was a strong cue for estimating the illuminant color. In this paper I introduced the luminance balance hypothesis, a novel hypothesis, which is based on estimation of illuminants using the luminance distribution of the optimal colors.View full abstractDownload PDF (627K) -
Katsuaki SAKATAArticle type: Article
Session ID: HI2011-88
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe interocular transfer of aftereffects caused by long-term chromatic adaptation was measured. Results revealed that all the subjects showed interocular transfer of chromatic adaptation, the data measured in the non-adapted eye exhibited not only the same hue as the adaptation stimuli but also a direction opposite to the adaptation stimuli, suggesting the important roles of the opponent-colour mechanism. The hue of after-effects should be decided by the comparison of the inputs from 3 types of photoreceptors after the trichromatic mechanism. Because of the transient chemical characteristics of human photoreceptors, the pattern of the monocular chromatic after-effect after the disappearance of adaptation light was measured in both eyes in order to know the balance of the effects of photoreceptors and high-cognitive process. chromatic after-effects are caused by a high-order cortical process functions in chromatic adaptation.View full abstractDownload PDF (910K) -
Keizo SHINOMORI, Shigeki NAKAUCHIArticle type: Article
Session ID: HI2011-89
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSColor deficiency is ordinarily caused by unfunctionality of one cone type in three cone types on human retina by a genetic reason. Ordinary color deficient people, protanopes and deuteranopes, cannot discriminate certain combinations of colors, especially certain combinations of red and green. This problem can be minimized by using suitable color combinations on color presentation like sign, called as color universal design. However, it is difficult for color normal people to use suitable colors for the color universal design. Thus, we have developed the optical functional-filter, which can simulate the difficulty of color discrimination on protanopes and deuteranopes, as a tool of the color universal design. The filter is quantitatively enough accurate as a checking tool for color discrimination of color deficients. Furthermore, by psychophysical experiments, we have investigated how extent this filter is effective as the simulation of color appearance of color deficients for color normal people. With the investigation of color appearance of color deficients, we found that the filter is enough effective and in a certain extent, it is reasonable as the simulation of color appearance.View full abstractDownload PDF (154K) -
Yuki ONO, Takehiro NAGAI, Michiteru KITAZAKI, Kowa KOIDA, Shigeki NAKA ...Article type: Article
Session ID: HI2011-90
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe aimed to extract object image regions contributing to translucency perception using the Classification Image method with CG images whose translucency was controlled by the strength of subsurface scattering (SSS) in order to examine image statistics related to translucency on 3D objects. The stimulus was the composition of two CG images with different SSS strengths according to a random spatial pattern. The observer simultaneously viewed the two stimuli that were created based on different composition patterns, and responded which stimulus yielded stronger translucency perception. The composition patterns of all trials were classified into two classes based on the observers' responses, and were averaged in each class. Then, we derived CIs as the differences between the averaged patterns between the two classes. The CIs showed that the observer judged the object translucency not on the whole image but on certain regions in the object images, indicating that these regions were more strongly related to translucency perception. In addition, the observer judged translucency based not on regions with clear shading luminance edges, but on regions that have little luminance variations. These results suggested that translucency perception do not strongly depend on local luminance contrast information.View full abstractDownload PDF (797K) -
Natsuko Hatsusaka, Yusuke Suzuya, Tetsuo Kawahara, Hiroshi SasakiArticle type: Article
Session ID: HI2011-91
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSEye movements during reading are consisted of repetitions of saccade and fixation and function effectively. Meanwhile, it shows that reading speed decreases even in the healthy elderly due to some effects such as presbyopia. We examined a relationship between decrease of reading speed and eye movements with aging. Subjects comprised 15 adults from 21 to 60 years old with no ophthalmic diseases. Experiment1: The subjects were asked to read the clinical-used vertical text, MNREAD-J, 10 letters ×3 lines (30 letters), appeared on PC, and showed 30 times each letter size of logMAR 10 and 0.5 with keeping 30 cm distances from the text. We measured fixation time, fixation frequency, eye-movement tracking, and pupil size using Eyemark Recorder (Nac). Experiment2: The elderly tend to have low near visual acuity because of accommodation degeneration. We compared eye movements of young adult with of the elderly under a certain condition which young adult asked to reduce vision with convex lenses. The mean logMAR among the elderly was 0.13±0.11 and near visual acuity of young adult was reduced under the average. Text was reformed MNREAD-J, 20 vertical letters with logMAR 1.0 and 0.5 size, and measured in the same way as Experience 1. Reading speed decreased with aging. Fixation frequency of 50s increased compared with 20s although there was no difference in fixation time with age, which showed saccade length decreased significantly (p<0.05) and suggested that this was a main reason of decrease of reading speed in the elderly. Saccade length of young adult was significantly long compared with the elderly with the usage of convex lenses (p<0.05). Also the elderly made regressions back frequently. Decrease of reading speed with aging is attributed to reduction of saccade length not to the delay of fixation time and has something to do with factors other than degeneration of near visual acuity.View full abstractDownload PDF (789K) -
Koichiro SHINOHARA, Kazuho FUKUDA, Keiji UCHIKAWAArticle type: Article
Session ID: HI2011-92
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWhen jitter is attached to a regional screen beyond the visual spatial frequency response, banding (a transversal line) occurs. Therefore we confirmed the banding appearance when we gave screen as carrier with the single frequency, and jitter as side band by experiment. The following became clear with screen frequency 69cpd, jitter frequency 5.2cpd and sensitivity by 2AFC. a) The 2nd order harmonics or higher decreases the banding recognition rate. b) The contribution of cross term within carrier and side band is big, and strongly suggested the presence of nonlinearity before V1. As a result, moire is regarded as the main factor of the banding.View full abstractDownload PDF (620K) -
Article type: Appendix
Pages App1-
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (88K) -
Article type: Appendix
Pages App2-
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (88K) -
Article type: Appendix
Pages App3-
Published: December 02, 2011
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (88K)
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