᪥ᚰ➨ 㻣㻡 ᅇ䠄㻞㻜㻝㻝䠅㻌 ゝㄒ䞉ᛮ⪃㻌 㻟㻭㻹㻝㻟㻣㻌 ࣟࢽ࣮ࡢពᅗ⌮ゎ㛵ࡍࡿ⚄⤒ᇶ┙㸸fMRI ◊✲ ⛅ۑඖ㢗Ꮥ㸯࣭ᮡᾆඖு㸯࣭ⶇ⏣ᖾே㸰㠀ဨ࣭ᐑෆㄔ࢝ࣝࣟࢫ㸯㠀ဨ ࣭ᐑ⃝ᚿಖ㸱࣭ᕝᓥ㝯ኴ㸯㠀ဨ 㸦㸯ᮾᏛᏛ㝔ຍ㱋་Ꮫ◊✲⛉࣭㸰⋢ᕝᏛ⬻⛉Ꮫ◊✲ᡤ࣭㸱ᮾᏛ་Ꮫ⣔◊✲⛉㸧 ࣮࣮࢟࣡ࢻ: ࣟࢽ࣮ࠊfMRIࠊྑୖഃ㢌ᅇ࣭ྑ୰ഃ㢌ᅇ Neural substrates of intention comprehension of verbal irony: an fMRI study Yoritaka AKIMOTO1, Motoaki SUGIURA1, Yukihito YOMOGIDA2,#, Carlos Makoto MIYAUCHI1,#, Shiho MIYAZAWA3, and Ryuta KAWASHIMA 1,# 1 ( Institute of Developing, Aging and Cancer (IDAC), Tohoku Univ., 2Brain Science Institute, Tamagawa Univ., 3 Graduate School of Medicine, Tohoku Univ.) Key words: irony, fMRI, right superior and middle temporal gyri ┠ ⓗ fMRI ࡣࠊ3TMRI ⨨ࢆ⏝࠸ࡓࠋゎᯒ࡛ࡣࠊSPM5 ࢆ⏝࠸ࠊ ⏬⣲ẖࠊྛ᮲௳ࡢ⬻άື㔞ࢆ᥎ᐃࡋࠊ⿕㦂⪅㛫࡛ one-sample ࣟࢽ࣮ࡣࠊⓎヰ≧ἣࡢࡎࢀࡼࡗ࡚ࠊⓎヰ≧ἣ t-test ࢆ⾜ࡗࡓࠋᐇ㦂ࡣࠊᮾᏛ་Ꮫ⣔◊✲⛉⌮ጤဨࡢ ᑐࡍࡿヰࡋᡭࡢែᗘࢆᬯ♧ࡍⓎヰ࡛࠶ࡿࠋඛ⾜◊✲࡛ࡣࠊ ᢎㄆࡢࡶ⾜ࡗࡓࠋ ࣟࢽ࣮⌮ゎ㛵ࡍࡿ⚄⤒ᇶ┙ࡋ࡚ࠊෆഃ๓㢌๓⓶㉁ࠊ ഃ㢌ᴟࠊ║❐๓㢌⓶㉁࠸ࡗࡓ㡿ᇦࡀሗ࿌ࡉࢀ࡚࠸ࡿ (⥆䛝) (Uchiyama et al., 2006; Wakusawa et al., 2007; Shibata et al., 2010)ࠋࡇࢀࡽࡢ㡿ᇦࡣᚰࡢ⌮ㄽ㛵㐃ࡍࡿ㡿ᇦࡋ࡚▱ ࡽࢀࠊࣟࢽ࣮⌮ゎᚰࡢ⌮ㄽࡀᚲせ࡛࠶ࡿ࠸࠺▱ ぢᩚྜⓗ࡛࠶ࡿࠋ ࡋࡋࠊࣟࢽ࣮⌮ゎࡣ」ᩘࡢฎ⌮ࡽ࡞ࡿ」㞧࡞ ฎ⌮㐣⛬࡛࠶ࡾ(⛅ඖ࣭㑚ᮏ, 2007)ࠊࣟࢽ࣮⌮ゎࡢ II UI NI ࡢഃ㠃ࡢ⬻㡿ᇦࡀ㛵ࡋ࡚࠸ࡿࡢࡀ᫂ࡽ࡛࡞࠸ࠋ ࡑࡇ࡛ᮏ◊✲࡛ࡣࠊ ࠕヰࡋᡭࡢࣟࢽ࣮ពᅗࠖࡢ⌮ゎ 㛵ࡍࡿ⚄⤒ᇶ┙ࢆྠᐃࡍࡿࢆ┠ⓗࡍࡿࠋ ᪉ ἲ ᐇ㦂ཧຍ⪅ 39 ྡࡢᖖ࡞ྑࡁࡢᏛ⏕ࡀཧຍࡋࡓࠋ (ྑୖ ᮦᩱ 80 ಶࡢ≀ㄒࢆ⏝ࡋࡓ(ᅗ 1)ࠋࡇࢀࡽࡢ≀ㄒ࡛ࡣࠊ 䛻⥆䛟) ͆࠶࡞ࡓ㸦┿ࢇ୰ୗࡢ࢟ࣕࣛࢡࢱ࣮㸧͇ࠊⓏሙே≀ A㸦⏨ᛶ㸧ࠊ ᅗ䠍 ≀ㄒ䛾 Ⓩሙே≀ B㸦ዪᛶ㸧ࡢ㸱ேࡢࡸࡾࡾࡀᅄࢥ࣐ₔ⏬ࡢࡼ ⤖ ᯝ ࠺࡞ᙧᘧ࡛㸯ࢥ࣐ࡎࡘᥦ♧ࡉࢀࡿࠋ࠸ࡎࢀࡢ≀ㄒࡘ࠸࡚ࡶ ᐇ㦂୰ᐷ࡚ࡋࡲࡗࡓཧຍ⪅ࠊ㢌ࡀ 3mm ௨ୖື࠸ࡓཧຍ 㸲ࡘࡢ᮲௳㸦ពᅗⓗࣟࢽ࣮᮲௳(Intentional Irony; II)ࠊ㠀 ⪅ࠊࣟࢽุ࣮᩿ㄢ㢟ࡢṇ⟅⋡ࡀపࡗࡓཧຍ⪅ࡣゎᯒ ࣟࢽ࣮᮲௳(Non Irony; NI)ࠊ㠀ពᅗⓗࣟࢽ࣮᮲௳ ࡽ㝖እࡋࡓࠋࡑࡢ⤖ᯝࠊ⏨ᛶ 11 ྡࠊዪᛶ 14 ྡࡢィ 25 ேࡢࢹ (Unintentional Irony; UI)ࠊࣇ࣮ࣛ᮲௳㸧ࡀᏑᅾࡍࡿࠋII ᮲௳ ࣮ࢱࢆゎᯒࡋࡓࠋࣟࢽ࣮ពᅗุ᩿ㄢ㢟ࡢṇ⟅⋡ࡣࠊII, NI, ࡛ࡣࠊ㸲ࢥ࣐┠࡛͆࠶࡞ࡓ͇ࡀఱኻᩋࡋࠊ㸳ࢥ࣐┠࡛ࡑࢀ UI ᮲௳ࡢࡑࢀࡒࢀ࡛ࠊ96.2%, 98.4%, 87.6%࡛࠶ࡗࡓࠋ ࢆ┠ᧁࡋ࡚࠸ࡓⓏሙே≀ࡽᏐ⩏ⓗ࣏ࢪࢸࣈ࡞ゝⴥ㸦ࡍ fMRI ࡢゎᯒ࡛ࡣࠊࣟࢽุ࣮᩿ṇ⟅ࡋࡓヨ⾜ࡢࡳࢆゎ ࡞ࢃࡕࠊࣟࢽ࣮㸧ࢆゝࢃࢀࡿࠋNI ᮲௳࡛ࡣࠊ㸲ࢥ࣐┠࡛ ᯒྵࡵࡓࠋII ᮲௳ NI ᮲௳ࢆẚ㍑ࡋࡓᕪศゎᯒ࡛ࡣࠊෆഃ ͆࠶࡞ࡓ͇ࡀఱᡂຌࡋࠊ㸳ࢥ࣐┠࡛ࡑࢀࢆ┠ᧁࡋ࡚࠸ࡓⓏሙ ๓㢌๓㔝(ᅗ 2a)࠾ࡼࡧྑഃ㢌ᴟ(ᅗ 2b)࠾࠸࡚ࠊII ᮲௳ UI ே≀ࡽᏐ⩏ⓗ࣏ࢪࢸࣈ࡞ゝⴥ㸦ࡍ࡞ࢃࡕࠊࡵࡸឤㅰ㸧 ᮲௳ࢆẚ㍑ࡋࡓᕪศゎᯒ࡛ࡣࠊྑୖഃ㢌ᅇ࣭ྑ୰ഃ㢌ᅇ࠾ ࢆゝࢃࢀࡿࠋUI ᮲௳࡛ࡣࠊ㸲ࢥ࣐┠࡛͆࠶࡞ࡓ͇ࡀఱኻᩋ ࠸࡚᭷ព㧗࠸㈿ά(p<0.001, corrected p<0.05 at cluster-level) ࡍࡿࡀࠊ㸳ࢥ࣐┠࡛ࡣࡑࢀࢆ┠ᧁࡋ࡚࠸࡞࠸Ⓩሙே≀ࡽᏐ ࢆㄆࡵࡓ㸦ᅗ 2c㸧ࠋ ⩏ⓗ࣏ࢪࢸࣈ࡞ゝⴥࢆゝࢃࢀࡿࠋࡇࡢ᮲௳࠾࠸࡚ࠊ⪺ a b c ࡁᡭࡣࣟࢽ࣮ࡽࡋࡉࢆឤࡌࡿࡇࡀ▱ࡽࢀ࡚࠸ࡿࡀ(⛅ ඖ࣭㑚ᮏ, 2007)ࠊヰࡋᡭࡣ͆࠶࡞ࡓ͇ࡢኻᩋࢆ┠ᧁࡋ࡚࠸࡞ ࠸ࡇࡽࣟࢽ࣮ࡣពᅗࡉࢀ࡚࠸࡞࠸㸦㸯㹼㸱ࢥ࣐┠ࡲ ࡛ࡢࡸࡾྲྀࡾࡶ࡙࠸࡚ࠊᏐ⩏ⓗ࣏ࢪࢸࣈ࡞ពࡀព ᅗࡉࢀ࡚࠸ࡿ㸧ࠋࣇ࣮ࣛ᮲௳࡛ࡣࠊ㸲ࢥ࣐┠࡛͆࠶࡞ࡓ͇ࡀ (II-UI) (II-NI) ᅗ2 (II-NI) ఱᡂຌࡍࡿࡀࠊUI ᮲௳ྠᵝ㸳ࢥ࣐┠࡛ࡑࢀࢆ┠ᧁࡋ࡚ ࠸࡞࠸Ⓩሙே≀ࡽᏐ⩏ⓗ࣏ࢪࢸࣈ࡞ゝⴥࢆゝࢃࢀࡿࠋ ⪃ ᐹ ᡭ⥆ࡁ ᐇ㦂ཧຍ⪅ࡣࠊ☢Ẽඹ㬆⏬ീ(MRI)⨨ෆᥦ♧ࡉ II ᮲௳ NI ᮲௳ࡢẚ㍑ࡼࡗ࡚ࠊࣟࢽ࣮⌮ゎᚰࡢ⌮ ࢀࡿ≀ㄒࢆࠊⓏሙே≀ࡢ୍ே࡛࠶ࡿ͆࠶࡞ࡓ͇࡞ࡗࡓࡘࡶ ㄽ㛵㐃㡿ᇦࡀ㛵ࡍࡿ࠸࠺ඛ⾜◊✲୍⮴ࡍࡿ▱ぢࢆᚓࡓࠋ ࡾ࡛⌮ゎࡋ࡚ࠊ≀ㄒࡢ᭱ᚋᥦ♧ࡉࢀࡿⓎヰᑐࡋ࡚ㅬ㐯ࡍ ࡲࡓࠊII ᮲௳ UI ᮲௳ࡢẚ㍑ࡼࡗ࡚ࠊࣟࢽ࣮ពᅗࡢ⌮ ࡿ࠺ࢆุ᩿ࡋ࡚࣮࢟ࢆᢲࡋ࡚ᅇ⟅ࡋࡓ㸦ࢲ࣑࣮ㄢ㢟㸧ࠋ ゎ㛵ࡍࡿ㡿ᇦࡋ࡚ྑୖഃ㢌ᅇ࣭ྑ୰ഃ㢌ᅇࢆྠᐃࡋࡓࠋ fMRI ᐃ⤊ᚋࠊᐇ㦂୰ᥦ♧ࡉࢀࡓ࡚ࡢ≀ㄒࡘ࠸࡚ࠊ ࡇࢀࡽࡢ㡿ᇦࡣ♫ⓗᴫᛕࢆ⾲㇟ࡋ࡚࠸ࡿࡉࢀ (Zahn et ヰࡋᡭࡢពᅗࡀࣟࢽ࣮࡛࠶ࡗࡓ࠺ࡢุ᩿ㄢ㢟ࢆ⾜ al., 2007)ࠊࣟࢽ࣮ࡀᏛ⩦ࡼࡿ♫ⓗᴫᛕ࡛࠶ࡿ࠸࠺ ࡗࡓࠋ ⪃࠼(Laval & Bert-Eboul, 2005)ࢆᨭᣢࡍࡿࡶࡢ࡛࠶ࡿࠋ ̿ 875 ̿
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