Piano pedals of the brain? New paper in Science this week teaches us how how emotion echoes across species. A groundbreaking paper by Kauvar, Deisseroth and colleagues hit a powerful chord in the world of neuroscience. Spoiler alert: our emotional responses, whether in mice or humans, emerge through a conserved, brain-wide 'persistence signal' that acts like the 'sustain pedal' on a piano, holding onto feeling after sensation. It’s a striking step forward in understanding how fleeting stimuli can evolve into enduring emotions. How does this reshape into human disease. Key Points: - There is a cross-species emotional blueprint. Both humans and mice exhibit a shared, conserved brain-wide response to brief aversive stimuli (like a puff of air to the eye). - There is a fast reflex and a slower, sustained emotional state. - Sensory input triggers a fast, brain wide signal. - This response is followed by a persistent, slower phase that represents emotion. - The slower phase spans networks across the brain. - The authors showed something very cool. Ketamine, a dissociative drug, disrupted the slow emotional response without affecting the initial fast sensory reaction. - In short, there was a separate system for sensation when they compared it to emotion. - The emotional persistence followed a first-order decay model. - The length of an emotional response was controlled by an intrinsic neural timescale. The scientists could shorten this timescale by using ketamine. - Do conditions like depression or PTSD have maladaptive timescales? Is there a too slow (rumination) or too fast (emotional blunting) mechanism underpinning disease? - Do we need novel drug strategies to restore the balance? My take: This is really a terrific study. Here are my 5 key takeaways. 1- Your brain has a sustain pedal and it can linger on emotion. 2- Mice and men/women create emotion through a similar 'persistent echo' after receiving a sensory hit. 3- Using intracranial recordings, the scientists uncovered an almost exact moment and location that emotion emerged from sensation. 4- Ketamine use showed the scientists that the brain’s emotional persistence was not fixed, and in fact could be 'dialed up or down.' 5- Can we use this information to develop precise treatments for mood disorders, PTSD, and emotional blunting? #EmotionalBrain #Neuropsychiatry #KarlDeisseroth #KetamineResearch #NeuroscienceNews @ParkinsonDotOrg @FixelInstitute @ScienceMagazine @KarlDeisseroth