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<h2><a href="/blog/20210927-%E7%A5%9E%E7%B6%93%E7%A7%91%E5%AD%B8%E8%88%87%E8%B3%87%E8%A8%8A%E7%90%86%E8%AB%96-part2/">神經科學與資訊理論 - Part 2</a></h2>
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<time datetime="2021-09-27 00:00:00 +0000 UTC">September 27, 2021</time>
<p>Pei</p>
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<a href="/blog/20210927-%E7%A5%9E%E7%B6%93%E7%A7%91%E5%AD%B8%E8%88%87%E8%B3%87%E8%A8%8A%E7%90%86%E8%AB%96-part2/" class="image" style="--bg-image: url('https://PikaPei.github.io/img/2021/0927/entropy.jpg');">
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<p><a href='https://pikapei.github.io/blog/20201109-神經科學與資訊理論-part1/' target='_blank'><strong>神經科學與資訊理論 - Part 1</strong></a><br>
前文中提及了不確定性與資訊熵的概念，但仍侷限在只有一個變數的情況，這篇文章將從一個變數增加至兩個變數，介紹聯合熵、條件熵，最後引入相互資訊和不確定性的關係。
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<h2><a href="/blog/20210815-%E6%9E%9C%E8%A0%85%E6%B1%82%E5%81%B6%E8%A1%8C%E7%82%BA%E7%9A%84%E8%AA%BF%E6%8E%A7%E6%A9%9F%E5%88%B6/">果蠅求偶行為的調控機制</a></h2>
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<time datetime="2021-08-15 00:00:00 +0000 UTC">August 15, 2021</time>
<p>Pei</p>
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<p>當雄果蠅未處於求偶狀態時，就算雌果蠅在附近也無動於衷，一旦進入求偶狀態，雄果蠅則會積極地追逐雌果蠅，並揮舞單邊翅膀，科學家描述這是首「求偶之歌」[1]。同樣看見雌果蠅，卻表現出兩種不同的行為，代表果蠅大腦有著不一樣的內在狀態，過去的研究中發現，活化P1神經元能夠讓果蠅進入性喚起狀態 (sexual arousal state)，展現出求偶行為。而此篇來自洛克菲勒大學的研究更發現了P1神經元會調控LC10a視覺神經迴路，因此即使接收到相似的視覺訊號，求偶行為也會受到當下P1神經元的活性高低而影響，研究成果發表在 <em>Nature</em> 期刊。
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<h2><a href="/blog/20210711-%E8%AD%98%E5%88%A5%E7%86%9F%E6%82%89%E9%9D%A2%E5%AD%94%E7%9A%84%E7%A5%96%E6%AF%8D%E7%A5%9E%E7%B6%93%E7%BE%A4/">識別熟悉面孔的「祖母神經群」</a></h2>
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<time datetime="2021-07-11 00:00:00 +0000 UTC">July 11, 2021</time>
<p>Pei</p>
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<p>先澄清，並沒有「祖母神經群」的說法。而是在1960年代時，由Jerome Lettvin提出的「祖母神經元」理論[1]，他提出這一顆神經元能夠辨認出祖母並喚醒相關記憶，若失去他，就再也認不得祖母了。換言之，這個理論認為一項事物或概念對應到一顆或一小群神經元，但此說法並沒有被廣泛支持。來自洛克菲勒大學 (Rockefeller University) 的研究團隊，發現一類位於TP (temporal pole, Fig. 1) 的神經元，能夠快速辨認出熟悉的臉，綜合了感覺細胞、記憶細胞的能力，就像是祖母神經元一樣，只是並非一顆神經元對應一張臉型，而是一群神經元一起運作，研究成果發表在 <em>Science</em> 期刊。</p>
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<h2><a href="/blog/20210711-%E8%AD%98%E5%88%A5%E7%86%9F%E6%82%89%E9%9D%A2%E5%AD%94%E7%9A%84%E7%A5%96%E6%AF%8D%E7%A5%9E%E7%B6%93%E7%BE%A4/">識別熟悉面孔的「祖母神經群」</a></h2>
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<h2><a href="/blog/20210419-fruit-fly-brain-observatory/">Fruit Fly Brain Observatory (FFBO) - 果蠅大腦觀測站</a></h2>
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<p>Explore The World of Neuroscience<br>Curious about Memory, Epilepsy, ASD ...</p>
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