<\/span><\/h3>\nPh\u1ea3n x\u1ea1 ho\u1ea1t \u0111\u1ed9ng th\u00f4ng qua h\u1ec7 th\u1ea7n kinh. Khi m\u1ed9t k\u00edch th\u00edch x\u1ea3y ra, c\u00e1c gi\u00e1c quan g\u1eedi t\u00edn hi\u1ec7u \u0111i\u1ec7n l\u00ean n\u00e3o th\u00f4ng qua tuy\u1ebfn th\u1ea7n kinh. Sau \u0111\u00f3, n\u00e3o s\u1ebd ti\u1ebfp nh\u1eadn v\u00e0 ph\u00e2n t\u00edch t\u00edn hi\u1ec7u n\u00e0y \u0111\u1ec3 \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh ph\u1ea3n \u1ee9ng nhanh ch\u00f3ng.<\/p>\n
Qu\u00e1 tr\u00ecnh n\u00e0y di\u1ec5n ra trong h\u1ec7 th\u1ed1ng th\u1ea7n kinh, bao g\u1ed3m c\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh nh\u01b0 gi\u00e1c quan (nh\u1eadn bi\u1ebft k\u00edch th\u00edch t\u1eeb m\u00f4i tr\u01b0\u1eddng), n\u00e3o (x\u1eed l\u00fd th\u00f4ng tin) v\u00e0 c\u01a1 co (ph\u1ea3n \u1ee9ng v\u1eadt l\u00ed ho\u1eb7c sinh l\u00fd).<\/p>\n
Tuy nhi\u00ean, kh\u00f4ng m\u1ecdi ph\u1ea3n \u1ee9ng t\u1ef1 \u0111\u1ed9ng c\u1ee7a c\u01a1 th\u1ec3 \u0111\u1ec1u l\u00e0 ph\u1ea3n x\u1ea1. M\u1ed9t s\u1ed1 ph\u1ea3n \u1ee9ng c\u00f3 th\u1ec3 l\u00e0 do qu\u00e1 tr\u00ecnh c\u1ea3m nh\u1eadn v\u00e0 suy ngh\u0129 c\u1ee7a con ng\u01b0\u1eddi, kh\u00f4ng ch\u1ec9 d\u1ef1a v\u00e0o s\u1ef1 k\u00edch th\u00edch t\u1eeb m\u00f4i tr\u01b0\u1eddng.<\/p>\n
Ph\u1ea3n x\u1ea1 l\u00e0 qu\u00e1 tr\u00ecnh t\u1ef1 \u0111\u1ed9ng c\u1ee7a c\u01a1 th\u1ec3 trong vi\u1ec7c ph\u1ea3n \u1ee9ng v\u1edbi s\u1ef1 k\u00edch th\u00edch t\u1eeb m\u00f4i tr\u01b0\u1eddng b\u00ean ngo\u00e0i. N\u00f3 gi\u00fap ch\u00fang ta t\u1ed3n t\u1ea1i v\u00e0 t\u01b0\u01a1ng t\u00e1c v\u1edbi th\u1ebf gi\u1edbi xung quanh. Hi\u1ec3u r\u00f5 v\u1ec1 ph\u1ea3n x\u1ea1 l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 hi\u1ec3u c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng c\u1ee7a c\u01a1 th\u1ec3 v\u00e0 \u00e1p d\u1ee5ng trong vi\u1ec7c \u0111i\u1ec1u ch\u1ec9nh h\u00e0nh vi v\u00e0 s\u1ee9c kh\u1ecfe c\u1ee7a b\u1ea3n th\u00e2n.
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