{"id":1908,"date":"2019-06-13T23:07:45","date_gmt":"2019-06-13T13:07:45","guid":{"rendered":"https:\/\/www.cognav.net\/?p=1908"},"modified":"2019-06-13T23:07:45","modified_gmt":"2019-06-13T13:07:45","slug":"optimal-dynamic-coding-by-mixed-dimensionality-neurons-in-the-head-direction-system-of-bats","status":"publish","type":"post","link":"https:\/\/braininspirednavigation.com\/?p=1908","title":{"rendered":"Optimal dynamic coding by mixed-dimensionality neurons in the head-direction system of bats"},"content":{"rendered":"<p>Finkelstein, Arseny, Nachum Ulanovsky, Misha Tsodyks, and Johnatan Aljadeff. &#8220;<a href=\"https:\/\/www.weizmann.ac.il\/neurobiology\/labs\/ulanovsky\/sites\/neurobiology.labs.ulanovsky\/files\/uploads\/finkelstein_etal_naturecomm2018.pdf\"><strong>Optimal dynamic coding by mixed-dimensionality neurons in the head-direction system of bats<\/strong><\/a>.&#8221; Nature communications 9, no. 1 (2018): 3590.<\/p>\n<p>Abstract\uff1a<\/p>\n<p style=\"text-align: justify;\">Ethologically relevant stimuli are often multidimensional. In many brain systems, neurons with \u201cpure\u201d tuning to one stimulus dimension are found along with \u201cconjunctive\u201d neurons that encode several dimensions, forming an apparently redundant representation. Here<span style=\"color: #ff0000;\"><strong> we show<\/strong><\/span><br \/>\n<span style=\"color: #ff0000;\"><strong>using theoretical analysis that a mixed-dimensionality code can efficiently represent a stimulus in different behavioral regimes: encoding by conjunctive cells is more robust when the stimulus changes quickly, whereas on long timescales pure cells represent the stimulus more efficiently with fewer neurons<\/strong><\/span>. We tested our predictions experimentally in the bat head direction system and found that<strong><span style=\"color: #ff0000;\"> many head-direction cells switched their tuning dynamically from pure to conjunctive representation as a function of angular velocity<\/span><\/strong>\u2014confirming our theoretical prediction. More broadly, our results suggest that <span style=\"color: #ff0000;\"><strong>optimal dimensionality depends on population size and on the time available for decoding\u2014which might explain why mixed dimensionality\u00a0 presentations are common in sensory, motor, and higher cognitive systems\u00a0<\/strong><\/span><span style=\"color: #ff0000;\"><strong>across species.<a href=\"https:\/\/www.weizmann.ac.il\/neurobiology\/labs\/ulanovsky\/sites\/neurobiology.labs.ulanovsky\/files\/uploads\/finkelstein_etal_naturecomm2018.pdf\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1911\" src=\"https:\/\/www.braininspirednavigation.com\/wp-content\/uploads\/2019\/06\/e.png\" alt=\"\" width=\"670\" height=\"599\" srcset=\"https:\/\/braininspirednavigation.com\/wp-content\/uploads\/2019\/06\/e.png 670w, https:\/\/braininspirednavigation.com\/wp-content\/uploads\/2019\/06\/e-150x134.png 150w, https:\/\/braininspirednavigation.com\/wp-content\/uploads\/2019\/06\/e-300x268.png 300w\" sizes=\"(max-width: 670px) 100vw, 670px\" \/><\/a><\/strong><\/span><\/p>\n<p style=\"text-align: center;\">Fig. 1 Head-direction coding by mixed-dimensionality neurons in the bat brain<\/p>\n<p>Finkelstein, Arseny, Nachum Ulanovsky, Misha Tsodyks, and Johnatan Aljadeff. &#8220;<a href=\"https:\/\/www.weizmann.ac.il\/neurobiology\/labs\/ulanovsky\/sites\/neurobiology.labs.ulanovsky\/files\/uploads\/finkelstein_etal_naturecomm2018.pdf\"><strong>Optimal dynamic coding by mixed-dimensionality neurons in the head-direction system of bats<\/strong><\/a>.&#8221; Nature communications 9, no. 1 (2018): 3590.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Finkelstein, Arseny, Nachum Ulanovsky, Misha Tsodyks, and Johnatan Aljadeff. &#8220;Optimal dynamic coding by mixed-dimensionality neurons in the head-direction system of bats.&#8221; Nature communications 9, no. 1 (2018): 3590. Abstract\uff1a Ethologically relevant stimuli are often multidimensional. In many brain systems, neurons with \u201cpure\u201d tuning to one stimulus dimension are found along with \u201cconjunctive\u201d neurons that encode [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[390,370,389,114,96,346],"tags":[396,493],"_links":{"self":[{"href":"https:\/\/braininspirednavigation.com\/index.php?rest_route=\/wp\/v2\/posts\/1908"}],"collection":[{"href":"https:\/\/braininspirednavigation.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/braininspirednavigation.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/braininspirednavigation.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/braininspirednavigation.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1908"}],"version-history":[{"count":1,"href":"https:\/\/braininspirednavigation.com\/index.php?rest_route=\/wp\/v2\/posts\/1908\/revisions"}],"predecessor-version":[{"id":1912,"href":"https:\/\/braininspirednavigation.com\/index.php?rest_route=\/wp\/v2\/posts\/1908\/revisions\/1912"}],"wp:attachment":[{"href":"https:\/\/braininspirednavigation.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1908"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/braininspirednavigation.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1908"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/braininspirednavigation.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1908"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}