Kanji Perception and Brain Function

2013 ◽  
pp. 266-273
Author(s):  
Ichiro Shimoyama ◽  
Hitoshi Shimada ◽  
Toshiaki Ninchoji
Keyword(s):  
Visual Perception ◽  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Semantic Processing ◽  
Visual Stimuli ◽  
Chinese Characters ◽  
Native Japanese Speakers ◽  
Temporal Lobes ◽  
Occipital Lobes ◽  
Multiple Analysis

The semantic processing involved in the visual perception of Chinese characters (Kanji) was studied using electroencephalograms. Thirty concrete Kanji, 30 absolute Kanji and a closed circle were used in a tachistoscopic presentation, wherein one character or a circle was displayed at random for 35 ms, and visual evoked potentials were recorded. The test subjects were11 native Japanese speakers. The concrete Kanji were familiar objects and highly imaginable characters such as a dog, a cat, a cow, etc. The absolute Kanji were familiar Kanji but represented concepts that are difficult to imagine, such as nothing, what, existing, et cetera. P100, N160, P230, and N320 were noted on the evoked potentials. The bilateral posterior temporal lobes and the bilateral occipital lobes were activated for the concrete Kanji at approximately 320ms after the onset of the visual stimuli (P<0.001 by multiple analysis of variance).

Holistic Integration in the Processing of Chinese Characters as Revealed by Electroencephalography Frequency Tagging

Perception ◽  
2020 ◽  
Vol 49 (6) ◽  
pp. 658-671
Author(s):  
Yazhi Cai ◽  
Yudi Mao ◽  
Yixuan Ku ◽  
Jing Chen
Keyword(s):  
Steady State ◽  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Perceptual Expertise ◽  
Chinese Characters ◽  
Occipital Area ◽  
Brain Areas ◽  
Visual Words ◽  
Holistic Integration ◽  
Different Parts

It is debated whether perceptual expertise of nonface objects, such as visual words, is indicated by holistic processing, which is regarded as a marker of perceptual expertise of faces. We address this question by frequency-tagged electroencephalography. Different parts of real or pseudo Chinese characters are presented at distinctive frequencies (6 or 7.2 Hz), which induce frequency-tagged steady-state visual-evoked potentials at occipital brain areas. The intermodulation response (e.g., 6 + 7.2 = 13.2 Hz) would emerge when holistic integration takes place. Our results suggest that the intermodulation response to the real characters is left lateralized, which is contralateral to previous findings with faces. Furthermore, at the left occipital area, the intermodulation response to real characters is more prominent than pseudo characters, suggesting that holistic integration is enhanced for real characters than for pseudo ones. Taken together, our findings suggest that holistic integration is potentially a general expertise marker for both faces and non-face objects.

Neurophysiologic correlates of implicit face memory in intracranial visual evoked potentials

Neurology ◽  
1997 ◽  
Vol 49 (5) ◽  
pp. 1312-1316 ◽  
Author(s):  
M. Seeck ◽  
N. Mainwaring ◽  
R. Cosgrove ◽  
H. Blume ◽  
D. Dubuisson ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Orbitofrontal Cortex ◽  
Evoked Responses ◽  
Push Button ◽  
Temporal Lobes ◽  
Clear Cut ◽  
Epileptic Patients ◽  
Explicit Recognition ◽  
Visual Evoked

Visual evoked potentials were recorded in the amygdala, hippocampus, mid- and inferotemporal cortex, orbitofrontal cortex, and lateral frontal cortex of seven epileptic patients while they were engaged in a difficult task requiring the discrimination between repeated and nonrepeated faces. The explicit recognition of previously seen faces was at chance levels, as measured by the accuracy of push-button responses. Nevertheless, all subjects showed clear-cut differential evoked responses to repeated versus nonrepeated faces, indicating implicit encoding of the distinction between the two types of stimuli. Differential responses were more frequent in neocortical recording sites (especially in the mid-and inferotemporal leads) than in limbic recording sites such as the amygdala and hippocampus. The authors conclude that implicit encoding processes are modulated by neocortical visual association areas of the temporal lobes.

PS-8-4 Visual evoked potentials elicited by high and low imaginable Chinese characters and pictures

1995 ◽  
Vol 97 (4) ◽  
pp. S101
Author(s):  
Ichiro Shimoyama ◽  
Yoshio Nakajima ◽  
Ken Nakazawa ◽  
Tsuyoshi Nakazato ◽  
Toshihiko Ito ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Chinese Characters ◽  
Visual Evoked

scholarly journals Prediction, Suppression of Visual Response, and Modulation of Visual Perception: Insights From Visual Evoked Potentials and Representational Momentum

2021 ◽  
Vol 15 ◽  
Author(s):  
Motohiro Kimura
Keyword(s):  
Visual Perception ◽  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Representational Momentum ◽  
Visual Object ◽  
Visual Response ◽  
Object Based ◽  
Visual Areas ◽  
Previous Proposal ◽  
Visual Evoked

When a visual object changes its position along with certain sequential regularities, the visual system rapidly and automatically forms a prediction regarding the future position of the object based on the regularities. Such prediction can drastically alter visual perception. A phenomenon called representational momentum (RM: a predictive displacement of the perceived final position of a visual object along its recent regular pattern) has provided extensive evidence for the predictive modulation of visual perception. The purpose of the present study was to identify neural effects that could explain individual differences in the strength of the predictive modulation of visual perception as measured by RM. For this purpose, in two experiments with a conventional RM paradigm where a bar was discretely presented in a regular rotation manner (with a step of 18° in Experiment 1 and a step of 20° in Experiment 2), visual evoked potentials (VEPs) in response to the regularly rotated bar were measured, and correlations between the magnitudes of RM and VEPs were examined. The results showed that the magnitudes of RM and central P2 were negatively correlated, consistently in both experiments; participants who showed a smaller central P2 tended to exhibit greater RM. Together with a previous proposal that central P2 would represent delayed reactivation of lower visual areas around the striate and prestriate cortices via reentrant feedback projections from higher areas, the present results suggest that greater suppression of delayed reactivation of lower visual areas (as indicated by smaller central P2) may underlie stronger predictive modulation of visual perception (as indicated by greater RM).

Effect of Emotions on Visual Evoked Potentials

1974 ◽  
Vol 39 (1) ◽  
pp. 663-668 ◽  
Author(s):  
Clara Torda
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Cognitive Processes ◽  
Visual Stimuli ◽  
Blank Card ◽  
Wave Complex ◽  
Visual Evoked

The effects of anxiety and anger on the visual evoked potentials generated by exposure to visual stimuli (circle or square as compared to blank card) did not for 80 human Ss modify the latencies or the amplitude of P1, P2, N1 and N2 peaks. Anxiety and anger modified, however, in a statistically significant manner P3 and the following waves. The P3 – N4 wave complex seemed to relate to cognitive processes. The results suggest that the effects of cognitive processes related to anxiety and rage differ, at least in part.

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