Ãâó: Trends in cognitive sciences, volume 1, No. 6, pp. 203-209. September . 1997. ÀúÀÚ: Lee Osterhout, Judith McLaughlin and Michael Bersick.

Event-Related Brain Potentials and Human Language


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¾ð¾î¸¦ ¸¸µé°í ÀÌÇØÇÏ´Â ´É·ÂÀº ÀηùÀÇ °¡Àå µ¶Æ¯ÇÑ Æ¯Â¡ÀÌ´Ù. ¾î¸° ¾ÆÀ̵éºÎÅÍ ³ªÀÌµç ¾î¸¥±îÁö °ÅÀÇ ¸ðµç »ç¶÷µéÀº °Ñº¸±â¿¡´Â º° ¾î·Á¿ò ¾øÀÌ ¾ð¾î¸¦ ±¸»çÇϰí ÀÌÇØÇÑ´Ù. ±×·¯³ª Àΰ£ ¾ð¾îÀÇ Àúº¯¿¡ ±ò·ÁÀÖ´Â ÀÎÁöÀû ´º·±ÀÇ ÀÛ¿ëÀ» ¹àÈ÷±â´Â ¸Å¿ì ¾î·Æ´Ù. ±× ÀÌÀ¯·Î´Â ÀÌ °úÁ¤ÀÌ ¸Å¿ì ºü¸£´Ù´Â Á¡°ú º¹ÀâÇÏ´Ù´Â Á¡ ¶§¹®ÀÌ´Ù. ÀÎÁöÀû ¹ÝÀÀ (conscious response)¿¡ ¿µÇâÀ» ¹ÞÁö ¾ÊÀ¸¸é¼­ ¾ð¾î°úÁ¤À» °ËÃâÇÒ ¼ö ÀÖ´Â ¹æ¹ý·ÐÀÌ ÇÊ¿äÇÏ´Ù. ÀÌ·¯ÇÑ ¹æ¹ý ÁßÀÇ ÇÑ °¡Áö°¡ ¾ð¾îÀÇ ÀÌÇØ(comprehension)³ª ¸»À» ¸¸µå´Â µ¿¾È ÃøÁ¤µÇ´Â ³ú À¯¹ßÀüÀ§(event-related brain potential)ÀÌ´Ù[Âü°í¹®Çå 1] (¿ªÀÚ ÁÖ: PET³ª functional - MRI´Â ½Ã°£ ºÐÇØ´ÉÀÌ ¼ö ÃÊ Á¤µµ ÀÌ°í ¿ø¸®ÀûÀÎ ÇѰèÀÌ´Ù. ÇöÀç(1998³â 1¿ù)·Î½á´Â ³úÀüÀ§(EEG)¿Í ³úÀÚ±âÀå(MEG) ¸¸ÀÌ 1 ¹Ð¸®ÃÊ Á¤µµ·Î ³úÀÇ ºü¸¥ º¯È­¸¦ °ËÃâ ÇÒ ¼ö ÀÖ´Ù.).

³ú À¯¹ßÀüÀ§´Â ƯÁ¤ Á¤º¸Ã³¸®¸¦ ¼öÇàÇÏ´Â µ¿¾ÈÀÇ Àü±âÀû Ȱµ¿À» ¿¬¼ÓÀûÀ¸·Î ÃøÁ¤ÇÒ ¼ö ÀÖ´Ù. ÀÌ ±Û¿¡¼­´Â Àΰ£ÀÇ ¾ð¾î¿Í °ü·ÃµÈ ´º·±ÀÇ ¹ÝÀÀÀ» ³ú À¯¹ßÀüÀ§¿¡¼­ ¸Å¿ì ¹Î°¨ÇÏ°Ô º¸¿©ÁÖ´Â ÃÖ±ÙÀÇ ¿¬±¸µéÀ» ¼Ò°³Çϰí ÀÖ´Ù. ¶ÇÇÑ ¿¬±¸ÀÚµéÀº ¹®¹ýÀû (syntactic) ó¸®¿Í ÀǹÌÀû(semantic) ó¸®ÀÇ ºÐ¸®¼º(separability)À» ¿¬±¸Çϱâ À§ÇÏ¿© ³ú À¯¹ßÀüÀ§¸¦ »ç¿ëÇϰí ÀÖ´Ù. º» ±ÛÀº "¾ð¾î ÀÌÇØ", "¾ð¾î ±¸»ç", "¾ð¾î Àå¾Ö" ¼øÀ¸·Î ³ú À¯¹ßÀüÀ§¿Í °ü·ÃµÈ ÀÌÀüÀÇ ´ëÇ¥ÀûÀÎ ¿¬±¸ °á°úµéÀ» Á¤¸®ÇÏ¿© º¸°í Çϰí ÀÖ´Ù. ÀÌ Áß¿¡¼­ º» ³í¹®¿¡¼­ °¡Àå ÇÙ½ÉÀûÀÎ ³»¿ëÀÎ "À½¼ÒÀÇ ÀνÄ", "¹®¹ý°ú ÀǹÌ" ¿Í °ü·ÃµÈ ½ÇÇè°á°úµéÀ» ¼Ò°³ÇÑ´Ù.

À½¼ÒÀÇ ÀνÄ(phoneme perception)

¿ë¾î¼³¸í: "À½¼Ò" = ÇÑ ¾ð¾î¿¡ À־ Àǹ̸¦ ±¸º°ÇÏ´Â ±â´ÉÀ» ÇÏ´Â À½¼º»óÀÇ ÃÖ¼Ò´ÜÀ§.

»ç¶÷Àº ¸»À» ÀνÄÇÒ ¶§ "¹üÁÖ·Î ºÐ¸®(categorically)"ÇÏ¿© ÀνÄÇÑ´Ù. Áï, ¹ßÀ½¿¡¼­ÀÇ »óÈ£ °æ°è¿¡ ¹Î°¨ÇÏ´Ù[Âü°í¹®Çå 2]. »Ó¸¸ ¾Æ´Ï¶ó °« ž ¾Æ±âÀÇ °æ¿ì¿¡µµ ¹ßÀ½ÀÇ Â÷ÀÌÁ¡¿¡ ¸Å¿ì ¹Î°¨ÇÏ´Ù[Âü°í¹®Çå 2]. ÀÌ¿Í °°ÀÌ "¹üÁֺзù ÀνÄ(categorical perception )"ÀÇ ¼±ÃµÀûÀÎ ¼ºÇâÀº ¾ð¾îÀû °æÇè(¶Ç´Â ÈÆ·Ã)¿¡ ÀÇÇÏ¿© Áõ´ëµÇ°í ¶ÇÇÑ º¯ÇüµÈ´Ù. »ýÈÄ 6°³¿ù Á¤µµ¸é ½Å»ý¾Æ´Â ÀÚ½ÅÀÇ ¸ð±¹¾î ¹ßÀ½¿¡¼­ÀÇ Ä«Å×°í¸®ÀÇ "¿øÇü(prototypes)"À» Çü¼ºÇÑ´Ù[Âü°í¹®Çå 3]. ÀÌµé ¿øÇüÀº À½¼ºÀÇ ¹üÁÖÀÇ °æ°è¸¦ ÀçÁ¶Á÷ÇÏ´Â ±Ù°£À¸·Î »ý°¢Çϰí ÀÖ´Ù.

ÃÖ±ÙÀÇ ¿¬±¸¿¡ ÀÇÇÏ¸é ³ú À¯¹ßÀüÀ§°¡ À½¼ÒÀÎ½Ä (phoneme perception)¿¡ À־ÀÇ ¹üÁÖÀûÀÌ°í ¿øÇüÀûÀÎ ¾ç»ó¿¡ ¿µÇâÀ» ¹ÞÀ½À» º¸¿©ÁÖ°í ÀÖ´Ù. ÀÌ ¿¬±¸´Â "mismatch negativity(MMN; À½¼º ºÒÀÏÄ¡? - ¹ø¿ªÇÏ¸é ¿ÀÈ÷·Á ÀÌÇØ°¡ ¾î·Á¿ï µí? )"¸¦ ÀÌ¿ëÇϰí ÀÖ´Ù (¿ªÀÚ ÁÖ: ¿©±â¼­ ¸»ÇÏ´Â negative¶õ ³ú À¯¹ßÀüÀ§ÀÇ ±Ø¼ºÀ» ÁöĪÇÏ´Â °ÍÀÌ´Ù. ). ³ú À¯¹ßÀüÀ§°¡ À½À¸·Î °¡´Â È¿°ú´Â ÇǰËÀÚ¿¡°Ô µé·ÁÁִ û°¢ÀÚ±ØÀÇ ¹°¸®Àû Ư¼ºÀÇ º¯È­¿¡ ¹ÝÀÀÇÏ´Â "Àü ÁÖÀÇ Ã³¸®(pre-attentive process )"À» ¹Ý¿µÇÏ´Â °ÍÀ¸·Î »ý°¢Çϰí ÀÖ´Ù[Âü°í¹®Çå 4].

¿¬±¸ÀÚµéÀº Ç¥ÁØÀûÀÎ ¸»À» ºñÁ¤»óÀûÀÎ ¸»°ú ÇÔ²² ¹«ÀÛÀ§·Î ÇǰËÀÚ¿¡°Ô µé·ÁÁÖ¾ú´Ù. ºñÁ¤»óÀûÀÎ ¸»ÀÇ °æ¿ì¿¡´Â Ç¥ÁØÀûÀÎ ¸»¿¡ ºñÇÏ¿© ´õ Å« MMNÀ» ³ªÅ¸³»¾ú´Ù[Âü°í¹®Çå 5]. ¶ÇÇÑ, ºñ¿øÇü(nonprototype)¿¡¼­ÀÇ ºñÁ¤»óÀûÀÎ ¸» º¸´Ù´Â ¹üÁÖÀÇ ¿øÇü¿¡¼­ÀÇ ºñÁ¤»óÀûÀÎ ¸»ÀÌ ´õ¿í Å« MMNÀ» ³ªÅ¸³»¾ú´Ù[Âü°í¹®Çå 6]. ÇÑÆí, ÀÌ¿Í °°Àº MMNÀ» ¹ß»ý½ÃŰ´Â ½Å°æ¼¼Æ÷ÀÇ À§Ä¡´Â Á¹ݱ¸ÀÇ ¾ð¾î ÇÇÁúÀÓÀÌ ¹àÇôÁ³´Ù[Âü°í¹®Çå 6]. ÀÌ·¯ÇÑ ¹ß°ßÀ» ÇÕ¸®ÀûÀ¸·Î ÇØ¼®ÇÏÀÚ¸é, À½¼Ò ÄÚµå(codes)´Â ½Å°æÇÐÀûÀ¸·Î´Â ¾ð¾î ÇÇÁú¿¡¼­ÀÇ °¨°¢±â¾ï(sensory memory)¿¡ ÇØ´çÇÑ´Ù°í º¼ ¼ö ÀÖ°í ¾ð¾îÀÇ ºÒÀÏÄ¡¸¦ °ËÃâÇÏ´Â Åä´ë¸¦ Á¦°øÇØ Áشٰí ÇÒ ¼ö ÀÖ´Ù[Âü°í¹®Çå 5,6].

¹®¹ý°ú ÀǹÌ(synatax and semantics)

¹®Àå¿¡¼­ÀÇ Â÷ÀÌÁ¡À¸·Î¼­ ¿ì¸®°¡ ÀνÄÇÒ ¼ö ÀÖ´Â °ÍÀ¸·Î ¹®¹ý(¹®ÀåÀÇ Çü½Ä)°ú ÀǹÌ(¹®ÀåÀÇ ÀǹÌ)°¡ ÀÖ´Ù. Á¤»óÀûÀÎ »ç¶÷À̶ó¸é "John slept the bed"¿Í °°Àº ¹®¹ýÀû ¿À·ù¸¦ °¡Áø ¹®Àå°ú "John spread his bread with socks"¿Í °°ÀÌ ÀǹÌÀû ¿À·ù¸¦ °¡Áø ¹®ÀåÀ» È®½ÇÈ÷ ±¸ºÐÇÒ ¼ö ÀÖ´Ù. ÀÌ·± ºÐº°·ÂÀÌ ±âÀúÀÇ ¾ð¾î 󸮿¡¼­µµ ¼­·Î ´Ù¸¥ °úÁ¤¿¡ ÀÇÇØ¼­ ÀÌ·ïÁö´Â °ÍÀΰ¡°¡ ³íÀïÀÌ µÇ¾î¿Ô´Ù. ÀϺΠ½É¸®¾ð¾îÇÐÀûÀÎ ¸ðµ¨¿¡¼­´Â ¹®¹ý°ú ÀǹÌÀÇ Â÷À̸¦ ½Äº°ÇÏ´Â °¢°¢ÀÇ Ã³¸®°úÁ¤À» °¡Á¤ÇÑ´Ù[Âü°í¹®Çå 8]. ¶Ç ´Ù¸¥ ¸ðµ¨¿¡¼­´Â À̸¦ ºÎÁ¤Çϰí ÀÖ´Ù[Âü°í¹®Çå 9].

³ú À¯¹ßÀüÀ§´Â ÀÌ ¹®Á¦¸¦ Á¶»çÇϱâ À§ÇÑ È¿°úÀûÀÎ ÃøÁ¤ ¼ö´ÜÀÌ µÉ ¼ö ÀÖ´Ù. ÀÎÁöÀûÀ¸·Î ´Ù¸¥ 󸮰úÁ¤ÀÌ ½Å°æÇÐÀûÀ¸·Î ¼­·Î ´Ù¸¥ ³ú ºÎÀ§¿¡¼­ ÀÌ·ïÁø´Ù°í »ý°¢Çϸé, ¹®¹ýÀû ó¸®¿Í ÀǹÌÀû ó¸® °¢°¢ÀÇ À¯¹ßÀüÀ§ÀÇ ÆÐÅÏÀÌ ´Ù¸£°Ô ÃøÁ¤µÈ´Ù¸é ÀÌ´Â ¼­·Î ´Ù¸¥ 󸮰úÁ¤¿¡ ÀÇÇØ ÀÌ·ïÁüÀ» Áõ¸íÇÑ °ÍÀÌ µÉ °ÍÀÌ´Ù.

ÀÌ ºÐ¾ßÀÇ ¿¬±¸¸¦ °³Ã´ÇÑ Kutas¿Í Hillyard´Â Àǹ̻ó ÀûÀýÇÏÁö ¸øÇÑ ¸»(¾ÕÀÇ ¿¹¿¡¼­ 'socks' °°Àº °æ¿ì )Àº ³ú À¯¹ßÀüÀ§¿¡¼­ N400 ¼ººÐÀÇ ÁøÆøÀ» Áõ°¡ ½ÃÅ´À» ¹ß°ßÇÏ¿´´Ù[Âü°í¹®Çå 10](¿ªÀÚÁÖ : 'N400' ¿¡¼­ 'N'Àº Negative¸¦ ÀǹÌÇÑ´Ù. ³úÀüÀ§ÀÇ ±Ø¼ºÀÌ À½À̶ó´Â ¶æÀ̰í, 400Àº ÀÚ±ØÀÌ ÁÖ¾îÁø ½ÃÁ¡ºÎÅÍ 400ms ÈÄ¿¡ ³ªÅ¸³µÀ½À» ÀǹÌÇÑ´Ù. ³ú À¯¹ßÀüÀ§¿¡¼­ ÈçÈ÷ »ç¿ëµÇ´Â ±Ô¾àÀÓ. ). ÀÌÈÄÀÇ ÀÏ·ÃÀÇ ¿¬±¸¿¡¼­´Â N400ÀÇ ÁøÆøÀº ¼±ÇàÇÏ´Â ¹®¸Æ°ú ´ë»ó ´Ü¾î°£ÀÇ ÀǹÌÀû "ÀûÇÕ¼º(congruence)"¿¡ ÀÇÁ¸ÇÔÀ» ¹àÇû´Ù[Âü°í¹®Çå 11].

³ú°¡ ¹®¹ýÀû ¿À·ù¸¦ ó¸®ÇÏ´Â °úÁ¤À» ³ú À¯¹ßÀüÀ§·Î °ËÃâÇÏ´Â ¿¬±¸ÀÚµéÀÇ °æ¿ì¿¡´Â ¾ÕÀÇ ÀǹÌÀû ½ÇÇè°á°ú¿Í´Â ´Þ¸® ¸Å¿ì ´Ù¾çÇÑ È¿°úµéÀ» º¸°íÇϰí ÀÖ´Ù[Âü°í¹®Çå 12-21]. ±×·¯³ª ºÐ¸íÇÑ Á¡Àº ¾ÕÀÇ N400 È¿°ú¿Í´Â ÀüÇô ´Ù¸£´Ù´Â °ÍÀÌ´Ù. ¹®¹ýÀû ¿À·ù°¡ ÀÖ´Â ¸»À» ÇǰËÀÚ¿¡°Ô µé·ÁÁÖ¸é ³ú À¯¹ßÀüÀ§¿¡¼­´Â ¼Ò¸®¸¦ µé·ÁÁØ ÈÄ 600ms¿¡ ±Ø¼ºÀÌ ¾çÀ¸·Î µÈ ÇÇÅ©°¡ °­ÇØÁø´Ù´Â Á¡ÀÌ ¹ß°ßµÇ¾ú´Ù[Âü°í¹®Çå 12-19]. Áï, " P600¿¡¼­ SPS(syntactic positive shift)°¡ »ý°å´Ù" ¶ó°í Ç¥ÇöÇÑ´Ù. °á·ÐÀûÀ¸·Î, P600ÀÇ ÁøÆøÀº ¹®À屸¼º¿ä¼Ò¿Í ´ë»ó ´Ü¾î°£ÀÇ ¹®¹ýÀû "ÀûÇÕ¼º(congruence)"¿¡ ÀÇÁ¸ÇÑ´Ù[Âü°í¹®Çå 17]. ¶ÇÇÑ Áß¿äÇÑ ½ÇÇè°á°ú·Î ¹®¹ý°ú Àǹ̰¡ ÀüºÎ Ʋ¸° ¸»À» µé·ÁÁÖ¸é N400°ú P600ÀÌ µ¿½Ã¿¡ ÃâÇöÇÑ´Ù[Âü°í¹®Çå 19].

³ú À¯¹ßÀüÀ§¿¡ À־ ¹®¹ýÀû ¿À·ù¿Í ÀǹÌÀû ¿À·ù°¡ ¼­·Î ´Ù¸£°Ô ¹ÝÀÀÇÔÀÌ ÃøÁ¤µÈ Á¡Àº ¹®¹ýó¸®¿Í ÀǹÌ󸮰úÁ¤ÀÌ ¼­·Î ´Ù¸£´Ù´Â ÁÖÀå°ú Àß ÀÏÄ¡Çϰí ÀÖ´Ù. ÇÑÆí, Neville°ú ±×ÀÇ µ¿·áµéÀº ´Ù¸¥ Áõ¸í ¹æ¹ýÀ» ÅëÇØ À̸¦ Áõ¸íÇϰí ÀÖ´Ù[Âü°í¹®Çå 22]. ÀÌµé ¿¬±¸ÀÚµéÀº °ü»ç³ª ÀüÄ¡»ç¿Í °°Àº ±â´ÉÀû ´Ü¾î(function words)¿Í ¸í»ç³ª µ¿»ç °°Àº ³»¿ë´Ü¾î(contents words)ÀÇ Â÷ÀÌÁ¡À» ³úÀ¯¹ßÀüÀ§·Î Á¶»çÇÏ¿´´Ù. ¿µ¾î¿¡ À־´Â ±â´É¾î¿Í ³»¿ë¾îÀÇ Â÷ÀÌ´Â ¹®¹ý°ú ÀǹÌÀÇ Â÷ÀÌ¿¡ ´ëÀÀµÉ ¼ö ÀÖ´Ù.

°á·Ð

³ú À¯¹ßÀüÀ§´Â Àΰ£ÀÇ ¾ð¾î Àúº¯ÀÇ ´º·±ÀÇ È°µ¿ »óȲÀ» ¼³¸í °¡´ÉÇÒ Á¤µµ·Î ¹Î°¨ÇÏ´Ù. ¶ÇÇÑ, ¾ð¾îÀÇ ±¸»ç¿Í ÀÌÇØ¸¦ ½Ç½Ã°£À¸·Î Á¶»çÇÒ ¼ö ÀÖÀ» Á¤µµ·Î ºü¸£´Ù. ¾ð¾î¿¡ ÀÇÇØ ¹ß»ýÇÑ N400°ú °°Àº ³ú À¯¹ßÀüÀ§¸¦ ÀÌ¿ëÇÏ¿© ÇØ´ç ´º·±ÀÇ À§Ä¡¸¦ ã´Â ¹ßÀüÀûÀÎ ¿¬±¸µµ ÁøÇàµÇ¾ú´Ù[Âü°í¹®Çå 37]. ÇÏÁö¸¸ ¾ÆÁ÷µµ ³ú À¯¹ßÀüÀ§·Î ¹àÇô¾ß ÇÒ ¸¹Àº ¾ð¾îÇö»óÀÌ ³²¾Æ ÀÖ´Ù. ³ú À¯¹ßÀüÀ§¶õ Àڱؿ¡ µ¿±âÈ­ µÇ¾î ÀÖ´Â ½ÅÈ£ ¸¸À» Æò±ÕÇÏ¿© °ËÃâÇÑ °ÍÀ̱⠶§¹®¿¡ ½ÇÁ¦ ÃøÁ¤µÈ °Í¿¡´Â Àڱؿ¡ µ¿±âÈ­ µÇ¾î ÀÖÁö ¾ÊÀº ³úÀÇ ÀÎÁöÀû 󸮰úÁ¤Àº °ËÃâÇÒ ¼ö ¾ø´Ù.

½ÇÁ¦ ¿ì¸®´Â ÃøÁ¤µÇ´Â '¾ð¾î¼º ³ú À¯¹ßÀüÀ§'¿Í 'ÀÎÁöÀû ÀÛ¿ë' »çÀÌ¿¡ ´ëÇØ¼­´Â °ÅÀÇ ¸ð¸£°í ÀÖ´Ù. Áï, ÃøÁ¤·®ÀÌ ½ÇÁ¦ ¾ð¾î 󸮰úÁ¤À» Á÷Á¢ÀûÀ¸·Î º¸¿©ÁÖ°í ÀÖ´Â °ÍÀÎÁö ȤÀº ´ÜÁö ¾ð¾î ó¸®¿Í °ü·ÃµÈ ´Ù¸¥ ¿µ¿ª¿¡¼­ ¹ß»ýÇÑ ½ÅÈ£¸¦ º¸¿©ÁÖ´Â °ÍÀÎÁö¸¦ ¸ð¸£°í ÀÖ´Ù. ¾ð¾î ±âÀúÀÇ Ã³¸®°úÁ¤¿¡ ´ëÇØ¼­ ¾ÕÀ¸·Î ¸¹ÀÌ ¿¬±¸µÇ¾î¾ß ÇÒ °ÍÀ̰í, ³ú À¯¹ßÀüÀ§´Â Àΰ£ÀÇ ¾ð¾î ¿¬±¸¿¡ À־ ÀÎÁöÀû ¸ðµ¨°ú »ý¹°ÇÐÀûÀÎ ±âÀú°£ÀÇ ¿¬°ü¼ºÀ» º¸¿©ÁÜ¿¡ À־ °è¼Ó À¯¿ëÇÑ µµ±¸·Î½á »ç¿ëµÉ °ÍÀÌ´Ù.


Âü°í¹®Çå
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