TY - GEN
T1 - Influence of moving sight by turning over frequency
AU - Ishihara, Shinya
AU - Sawada, Keisuke
AU - Kinoshita, Takayuki
AU - Ishida, Tomohiro
AU - Momose, Keiko
AU - Maeno, Masato
AU - Yanasihma, Kenji
AU - Magatani, Kazushige
PY - 2006
Y1 - 2006
N2 - In late years, f-MRI (functional Magnetic Resonance Imaging) are used for analysis of a visual function. In case of the study for a visual function, the checker flag pattern consists of white square and black square is usually used for sight stimulation. In sight stimulation using this pattern, a color of square (black and white) changes alternately at constant frequency. It is usually called pattern reversal stimulation. When this pattern is used for stimulation, the subject sometimes feels movement for the shown stimulation pattern. We think that this sensation of movement relates to spatial frequency (that means the size of a square of a stimulation pattern) of a stimulation image and a turning over frequency of a stimulation pattern strongly. Our objectives of this study are the following. 1) Clarify a part of the brain that is a cause of this moving sensation. 2) Investigate the relationship among the magnitude of this sensation, spatial frequency and turning over frequency. Three normal adults were used for the subject. This time, turning over frequency was changed from 0Hz to 8 Hz by 1Hz step under fixed spatial frequency. Under this condition, we examined the state of activation of a V1 area. In addition, we examined whether BOLD effect varied with a change of a stimulation color. In this experiment, we used blue and yellow color instead of black and white for stimulation, and the reaction was examined.
AB - In late years, f-MRI (functional Magnetic Resonance Imaging) are used for analysis of a visual function. In case of the study for a visual function, the checker flag pattern consists of white square and black square is usually used for sight stimulation. In sight stimulation using this pattern, a color of square (black and white) changes alternately at constant frequency. It is usually called pattern reversal stimulation. When this pattern is used for stimulation, the subject sometimes feels movement for the shown stimulation pattern. We think that this sensation of movement relates to spatial frequency (that means the size of a square of a stimulation pattern) of a stimulation image and a turning over frequency of a stimulation pattern strongly. Our objectives of this study are the following. 1) Clarify a part of the brain that is a cause of this moving sensation. 2) Investigate the relationship among the magnitude of this sensation, spatial frequency and turning over frequency. Three normal adults were used for the subject. This time, turning over frequency was changed from 0Hz to 8 Hz by 1Hz step under fixed spatial frequency. Under this condition, we examined the state of activation of a V1 area. In addition, we examined whether BOLD effect varied with a change of a stimulation color. In this experiment, we used blue and yellow color instead of black and white for stimulation, and the reaction was examined.
KW - FMRI visual cortex color V1 field MT field
UR - http://www.scopus.com/inward/record.url?scp=34047168315&partnerID=8YFLogxK
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U2 - 10.1109/IEMBS.2006.260013
DO - 10.1109/IEMBS.2006.260013
M3 - Conference contribution
C2 - 17945683
AN - SCOPUS:34047168315
SN - 1424400325
SN - 9781424400324
T3 - Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
SP - 1920
EP - 1923
BT - 28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'06
T2 - 28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'06
Y2 - 30 August 2006 through 3 September 2006
ER -