{"id":8928,"date":"2017-01-09T18:00:29","date_gmt":"2017-01-09T17:00:29","guid":{"rendered":"https:\/\/news.embl.de\/?p=8928"},"modified":"2024-03-22T13:33:40","modified_gmt":"2024-03-22T12:33:40","slug":"1701-neural-connection-instincts","status":"publish","type":"post","link":"https:\/\/www.embl.org\/news\/science\/1701-neural-connection-instincts\/","title":{"rendered":"Neural connection keeps instincts in check"},"content":{"rendered":"\n<p>From fighting the urge to hit someone to resisting the temptation to run off stage instead of giving that public speech, we are often confronted with situations where we have to curb our instincts. Scientists at EMBL have traced exactly which neuronal projections prevent social animals like us from acting out such impulses. The study, published online today in <em>Nature Neuroscience<\/em>, could have implications for schizophrenia and mood disorders like depression.<\/p>\n\n\n\n<p>\u201cInstincts like fear and sex are important, but you don\u2019t want to be acting on them all the time,\u201d says Cornelius Gross, who led the work at EMBL. \u201cWe need to be able to dynamically control our instinctive behaviours, depending on the situation.\u201d<\/p>\n\n\n\n<p>The driver of our instincts is the brainstem \u2013 the region at the very base of your brain, just above the spinal chord. Scientists have known for some time that another brain region, the prefrontal cortex, plays a role in keeping those instincts in check (see box down below). But exactly how the prefrontal cortex puts a break on the brainstem has remained unclear.<\/p>\n\n\n\n<p>Now, Gross and colleagues have literally found the connection between prefrontal cortex and brainstem. The EMBL scientists teamed up with Tiago Branco\u2019s lab at MRC LMB, and traced connections between neurons in a mouse brain. They discovered that the prefrontal cortex makes prominent connections directly to the brainstem.<\/p>\n\n\n\n<p>Gross and colleagues went on to confirm that this physical connection was the brake that inhibits instinctive behaviour. They found that in mice that have been repeatedly defeated by another mouse \u2013 the murine equivalent to being bullied \u2013 this connection weakens, and the mice act more scared. The scientists found that they could elicit those same fearful behaviours in mice that had never been bullied, simply by using drugs to block the connection between prefrontal cortex and brainstem.<\/p>\n\n\n\n<p>These findings provide an anatomical explanation for why it\u2019s much easier to stop yourself from hitting someone than it is to stop yourself from feeling aggressive. The scientists found that the connection from the prefrontal cortex is to a very specific region of the brainstem, called the PAG, which is responsible for the acting out of our instincts. However, it doesn\u2019t affect the hypothalamus, the region that controls feelings and emotions. So the prefrontal cortex keeps behaviour in check, but doesn\u2019t affect the underlying instinctive feeling: it stops you from running off-stage, but doesn\u2019t abate the butterflies in your stomach.<\/p>\n\n\n\n<p>The work has implications for schizophrenia and mood disorders such as depression, which have been linked to problems with prefrontal cortex function and maturation.<\/p>\n\n\n\n<p>\u201cOne fascinating implication we\u2019re looking at now is that we know the pre-frontal cortex matures during adolescence. Kids are really bad at inhibiting their instincts; they don\u2019t have this control,\u201d says Gross, \u201cso we\u2019re trying to figure out how this inhibition comes about, especially as many mental illnesses like mood disorders are typically adult-onset.\u201d<\/p>\n\n\n<hr class=\"vf-divider\"\/>\n\n\n<p><em>Tiago Branco is now at the Sainsbury Wellcome Centre<\/em><\/p>\n\n\n<div class=\"vf-box vf-box--normal vf-box-theme--primary\">\n<h2 class=\"vf-box__heading\">Background information: from metal rods to Pac-man<\/h2>\n<p class=\"vf-box__text\">Neuroscience textbooks have long carried the story of Phineas Gage. In 1848, while he was packing explosives into a rock to clear the way for a railroad, a premature explosion shot a metal rod through Gage\u2019s head. Remarkably, he survived. But his personality appears to have changed \u2013 although accounts and interpretations vary over what exactly the changes were, and how long they lasted. Nevertheless, Gage\u2019s case was instrumental in proving that there was a connection between brain and personality. Exactly which parts of Gage\u2019s brain were damaged has also been the subject of intense debate. The frontal lobes of his brain were certainly affected, and computer-based reconstructions of Gage\u2019s injury, as well as studies of other patients \u2013 injured in accidents or by stroke \u2013 have pointed to the prefrontal cortex as a likely seat for our inhibitions.<\/p>\n<p class=\"vf-box__text\">A study of people trying to avoid injury \u2013 albeit in a simulated environment \u2013 hinted at how that inhibition might come about. Looking at the brains of people as they played a Pac-man-like game in an MRI scanner, scientists found that while players were \u2018running away\u2019 from \u2018Pac-man\u2019, their prefrontal cortex was active, but in the moments just before their character was eaten, players\u2019 pre-frontal cortex would shut down and a region of the brainstem called the PAG became active. This study suggested a link between those two brain regions, and inspired Gross and colleagues to investigate.<\/p>\n<p class=\"vf-box__text\"><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>EMBL scientists find out how the prefrontal cortex puts a break on instinctive behaviours<\/p>\n","protected":false},"author":8,"featured_media":8933,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2,17591],"tags":[371,74,67,1748,514],"embl_taxonomy":[],"class_list":["post-8928","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science","category-science-technology","tag-gross","tag-monterotondo","tag-neurobiology","tag-press-release","tag-rome"],"acf":{"article_intro":"<p>EMBL scientists identify the physical connection through which the prefrontal cortex inhibits instinctive behaviours<\/p>\n","related_links":[{"link_description":"More on Phineas Gage","link_url":"http:\/\/www.slate.com\/articles\/health_and_science\/science\/2014\/05\/phineas_gage_neuroscience_case_true_story_of_famous_frontal_lobe_patient.html"},{"link_description":"Gross Group at EMBL","link_url":"http:\/\/www.embl.it\/research\/unit\/gross\/index.html"},{"link_description":"Branco Group at the Sainsbury Wellcome Centre","link_url":"https:\/\/www.ucl.ac.uk\/swc\/research\/Branco"}],"article_sources":[{"source_description":"<p>Franklin TB <em>et al<\/em>. <em>Nature Neuroscience<\/em>, published online 9 January 2016. DOI: 10.1038\/nn.4470<\/p>\n","source_link_url":"http:\/\/dx.doi.org\/10.1038\/nn.4470"}],"vf_locked":false,"featured":false,"color":"#007B53","show_featured_image":false,"in_this_article":false,"youtube_url":"","mp4_url":"","video_caption":"","translations":false,"press_contact":"EMBL Generic"},"embl_taxonomy_terms":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Neural connection keeps instincts in check<\/title>\n<meta name=\"description\" content=\"EMBL scientists in Monterotondo identify the physical connection through which the prefrontal cortex inhibits instinctive behaviour\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.embl.org\/news\/science\/1701-neural-connection-instincts\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Neural connection keeps instincts in check\" \/>\n<meta property=\"og:description\" content=\"EMBL scientists in Monterotondo identify the physical connection through which the prefrontal cortex inhibits instinctive behaviour\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.embl.org\/news\/science\/1701-neural-connection-instincts\/\" \/>\n<meta property=\"og:site_name\" content=\"EMBL\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/embl.org\/\" \/>\n<meta property=\"article:published_time\" content=\"2017-01-09T17:00:29+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-22T12:33:40+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.embl.org\/news\/wp-content\/uploads\/2016\/12\/170109-neural-connection_ib.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"620\" \/>\n\t<meta property=\"og:image:height\" content=\"425\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Sonia Furtado Neves\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@Aur_ora\" \/>\n<meta name=\"twitter:site\" content=\"@embl\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Sonia Furtado Neves\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"NewsArticle\",\"@id\":\"https:\/\/www.embl.org\/news\/science\/1701-neural-connection-instincts\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.embl.org\/news\/science\/1701-neural-connection-instincts\/\"},\"author\":{\"name\":\"Sonia Furtado Neves\",\"@id\":\"https:\/\/www.embl.org\/news\/#\/schema\/person\/d926199a955624b44dda296f396c5e68\"},\"headline\":\"Neural connection keeps instincts in check\",\"datePublished\":\"2017-01-09T17:00:29+00:00\",\"dateModified\":\"2024-03-22T12:33:40+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.embl.org\/news\/science\/1701-neural-connection-instincts\/\"},\"wordCount\":748,\"publisher\":{\"@id\":\"https:\/\/www.embl.org\/news\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.embl.org\/news\/science\/1701-neural-connection-instincts\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.embl.org\/news\/wp-content\/uploads\/2016\/12\/170109-neural-connection_ib.jpg\",\"keywords\":[\"gross\",\"monterotondo\",\"neurobiology\",\"press release\",\"rome\"],\"articleSection\":[\"Science\",\"Science &amp; 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