늦은 밤 홀로 TV를 보고 있던 주부
벼란간 안방 베란다 창문이 와장창 깨지면서 인척
놀란 주부 순간 심장이 콩당거리며 숨이 멎는 듯 팔다리에 힘이 들어간다.
자세히 볼 수 있다면
얼굴을 창백, 눈동자는 왕방울, 식은 땀을 감지할 수 있을 것이다.
뒤미쳐 현관문으로 도망갈 것인지 아니면 부엌의 칼을 빼 싸울 것인지 겶판을 내야한다.
시간이 흐른다.
전연 인기척이 없다.
살며시 안방 안을 살핀다.
이게 웬 일인가, 평고 덜렁거리던 창문이 베란다 쪽으로 넘어졌다. 바람에...
안도, 맥이 빠지고 숨을 내쉰다.
왜 이런 일이 벌어질까?
뇌가 없는 사람도 일어나는 현상일까? 식물인간, 어떨까?
뇌가 없으면 결코 진행되지 않을 공포.
공포의 경로가 뇌에 있다는 의미다.
1. 시상(Thalamus)이라 불리는 뇌중의 뇌가 뇌 가운데 있다. 여기서 후각을 제외한 감각, 시,청,촉,미각이
어디서 오는지 감지한다. 감지된 소리는 바로 감각중추로 넘어간다.
2. 감각중추(Sensory cortex)는 그 소리의 정체를 평가한다. 이어 그 자료를 또 넘긴다.
3. 해마(Hippocampus)로 넘어온 자료는 기억을 저장 복구하는 기관으로서 소리자극에 대한 정황을 판단.
4. 편도체(Amygdala)로 넘어와 이전의 공포기억으로 재생
5. 시상하부(Hypothalamus)에서 "싸울 건가 아니면 도망갈 것인가"를 결정한다.
과거의 입력된 공포의 기억이 어떠한가에 따라 같은 유리창 깨지는 소리에 담담할수도
또는 강도가 들었다고 실신할 수도 있을 것이다.
마음의 현상, 즉 뇌의 반응이 그 사람의 건강을 좌우하는 셈이다.
대책이 중요할 것이다.
위해서 뇌의 구조와 기능에 대한 최소한의 이해가 없이는 불가능하기에
다시 여행은 지속 될 것이다.
2013.12.21.
정 동 철
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