᪥ᚰ➨ 㻣㻠㻌 ᅇ䠄㻞㻜㻝㻜䠅㻌 ឤぬ䞉▱ぬ㻌 㻞㻱㼂㻝㻞㻣㻌 DNBG7F#-0WûñÈĈ¬$ìÑćùúĕjǺ¸ħ ºëÐ MRI #-0×Ý ÊĐ ¹ ĤÈÇ×Ý¢ ÇÈÇ×ÝđĖĥ 6PMPA: ñÕúºëÐĞėâ{wÐ ´H?K Cortical mechanisms of subjective color perception during Benham’s top illusion: a functional MRI study Hiroki C. Tanabe (Division of Cerebral Integration, NIPS) Key words: color perception, effective connectivity, dynamic causal modeling Wûñ %č%ñ$ú4È" 10à ñ$pÁ .ñ4ú0ñú4¤Qð#DNBG$ 7F &10Ïģ$C<PN4Å$ēæ#? 85N$7F%Å$ß$ĊĎWûñ43+ v ´ Ð # È 0 0 (Prevost-Fechner-Benham subjective colors)1(DNBG7F#-0Wûñ$È Ĉ#%$Ġ "1äîàê$¢Ð "ÔZaÉWûñÈĈ$W"÷ ç.10 ".äî"!$¯¶LDK%$Æą4h# Ą«0 k²Ã ,l /ìÑćùú ĕ$ĘT,ç.10Ĥvon Campenhausen and Schramme, 1995ĥ°×Ý%ºëÐÙ½iĢÍf¾(fMRI)4É DNBG$7F#-0WûñÕú¬$ìÑćùúĕjǺ ¸ 4 ì ¿ w (activation) º ë Ð Ğ ĕ ė â { (effective connectivity)$û .ü³·þ4ò ô Ġ è % Ö y ñ ú · µ ó - ' Farnsworth-Munsell 100-Hue test ñúÎ" n©1 7 }$ [ĤÌ 3 } 4 }ĥ °×Ý%DNBG$7F4É]S$ 2 $ fMRI Ġ4ò1 Ò% 5Hz Ċ0DNBG7FĤW ûñ±^ĥ 1#F>=ÄÇÐ#ñ47FĤÄ Çñ±^ĥ4ø0Ě$ì¿w4¼ċ0ĠĤñ DNBGĠĥ$Ġ%ùúgt$ÄÇÅ%Î"0 ñÕú% "/_0 4ÉWûñÕú ÄÇñ Õú$Ě$ì¿wđ`OºëÐâ{$Î|4·þ( DNBG$7F$ 1 $Å ĊĎc0 ¡%ÞY$Ġ DNBG$7F4 1, 1.5, 3, 4, 5Hz ĊĚ$ì¿w4ýÀĤĎDNBGĠĥ Xq$òwĠ#-/\$pÁ±^% 3Hz ]R7F ñø0 Øă .WûñÕú¬ (color perception) wÕú¬(motion perception)#ĘT0 ìđ`$lě4òWûÐñÕú#ĘT0ùúĞ $| Ğĕė$ºëÐâ{#·þ Ġ%ñÕú$ğx4ę+±^ pÁ$Ċª~ 4 4 Ü #m0ġĎXąĘď?85N4¥ÉôĠ è#%$Ēñ$ø#E<N£4,. 1 ;>9IN/z±^ 60 āòò14 10 ;>9I NòÉ MRI %ÈÇ×Ý¢#Āæ10 Siemens Ûõ Allegra 3T EPI §f$±^%]S$č/ (TR, 2000ms; TE, 30ms; FA, 75deg; 34 slices; voxel size 3x3x3mm)1 %o#ì$Ăà"ürÍf4§fÉ (Å$ùúĞ(V1, V2, V4, V4, V5)4|0+ RÿĠ#uĞ|$+$ fMRI Ġ4ö¨ò ü³#% SPM5 Brain Voyager QX 4É¿wđ`$ |%QðåH?K#-/òºëÐĞĕėâ{# %wÐ ´H?K(Dynamic Causal Modeling; DCM) (Friston et al., 2003)4bÉ ñDNBGĠ$â´Wûñ±^ÄÇñ±^ ,#ù úĕ$édOídUáĉ$Ć¿ă+.1$U±^$ ¿wĞ%Ĝ#_/Ó¦¼ċ,¿w#®" %).1" DCM #-0ü³4ò 2±^ ė#ãýÐ$ø.1ºëÐâ{đ`% V4V2 V2 V1 $Ħ$Čòâ{(backward connection)% 1,Wûñ±^$ªÄÇñ±^-/, Qª ĝòâ{(forward connection)0 V1V2 V2V4 #± ^ė$%).1" »#ĎDNBGĠ$â´4)0 hôĠè , 3Hz ]R$ĊĎñøWûñ$ø0±^Ĥ7N@J :@ĥ%W#ùúídĉ$¿wø.1$#w $Õú±^Ĥ7N@J:@ĥ%W#ùúĕédĉ$¿w ø.1DCM ü³$â´7F$ĊĎR0# 1ídĉ$ĝòâ{(V1V2V4) Čòâ{(V4 V2V1)"0 Ú1.#z±^# 0ôĠè$ñ$ø â{$$ÔĘ4) 2Rÿ #ÚºëÐâ{đ`#$)ġÔĘ4Ú ñDNBGĠ$â´ .DNBG$7F#-0Wûñ ÈĈ¬#,ÄÇÐ#ñ40pÁÅ$±^#-0ñ Õú |-"ìÑćùúĕjǺ¸e0 Ú1(ĎDNBGĠ$â´ .$Wû ñÕú#%č$ñÕú | V1, V2, V4, V4 4*ù ú$ídĉĘT0 Ú1 .#DNBG7F$Õú#W#ĘT0 ç. 10 V1, V2, V4, V4, V5 $Ğė$ DCM ü³$â´DN BG$7F#-0WûÐñÕú#% V1V2V4 $ºëÐâ {$V,Å# V4 . V2 4áË V1 #ï0Čò â{Ĕ÷"s4´0 Ú1 Friston, K.J., Harrison, L., & Penny, W. (2003). Dynamic causal modelling. Neuroimage, 19, 1273-1302. von Campenhausen, C., & Schramme, J. (1995). 100 years of Benham’s top in colour science. Perception, 24, 695-717. ̿ 559 ̿
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