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This shows a head made up of veggies Junk Food and the Brain: How Modern Diets Lacking in Micronutrients May Contribute to Angry Rhetoric * * * * * Reading Study Find First in Human Evidence of How Memories Form ShareTweet Home Featured Study Find First in Human Evidence of How Memories Form FeaturedNeuroscience *December 6, 2021 Summary: Researchers have identified the characteristics of over 100 memory-sensitive neurons that play a key role in how memories are recalled in the brain. Source: UT Southwestern Medical Center In a discovery that could one day benefit people suffering from traumatic brain injury, Alzheimer's disease, and schizophrenia, UT Southwestern researchers have identified the characteristics of more than 100 memory-sensitive neurons that play a central role in how memories are recalled in the brain. Bradley Lega, M.D., Associate Professor of Neurological Surgery, Neurology, and Psychiatry, said his findings, published in the journal NeuroImage, may point to new deep brain-stimulation therapies for other brain diseases and injuries. "It sheds important light on the question, 'How do you know you are remembering something from the past versus experiencing something new that you are trying to remember?'" said Dr. Lega, a member of the Peter O'Donnell Jr. Brain Institute. The most significant finding was that firing occurs with different timing relative to other brain activity when memories are being retrieved. This slight difference in timing, called "phase offset," has not been reported in humans before. Together, these results explain how the brain can "re-experience" an event, but also keep track of whether the memory is something new or something previously encoded. "This is some of the clearest evidence to date showing us how the human brain works in terms remembering old memories versus forming new memories," Dr. Lega said. His study identified 103 memory-sensitive neurons in the brain's hippocampus and entorhinal cortex that increase their rate of activity when memory encoding is successful. The same pattern of activity returned when patients attempted to recall these same memories, especially highly detailed memories. This activity in the hippocampus may have relevance to schizophrenia because hippocampal dysfunction underlies schizophrenics' inability to decipher between memories and hallucinations or delusions. The neurons identified by Dr. Lega are an important piece of the puzzle for why this happens, said Carol Tamminga, M.D., Professor and Chair of Psychiatry and a national expert on schizophrenia. This shows a womanThe most significant finding was that firing occurs with different timing relative to other brain activity when memories are being retrieved. Image is in the public domain "Hallucinations and delusions in people with a psychotic illness are actual memories, processed through neural memory systems like 'normal' memories, even though they are corrupted. It would be important to understand how to use this 'phase offset' mechanism to modify these corrupted memories," Dr. Tamminga said. An opportunity to learn more about human memory arose from surgeries where electrodes that were implanted in epilepsy's patients' brains to map the patients' seizures could also be used to identify neurons involved in memory. In this study, 27 epilepsy patients who had the electrodes implanted at UT Southwestern and a Pennsylvania hospital participated in memory tasks to generate data for brain research. The data analysis does not conclusively prove, but adds new credibility to important memory model called Separate Phases at Encoding And Retrieval (SPEAR) that scientists developed from rodent studies. "It's never been nailed down. It's one thing to have a model; it is another thing to show evidence that this is what's happening in humans," Dr. Lega said. The SPEAR model, which predicts the "phase offset" reported in the study, was developed to explain how the brain can keep track of new-versus-old experiences when engaged in memory retrieval. Previously, the only evidence in support of SPEAR came from rodent models. Dr. Tamminga holds the Stanton Sharp Distinguished Chair in Psychiatry. About this memory research news Author: Press Office Source: UT Southwestern Medical Center Contact: UT Southwestern Medical Center Image: The image is in the public domain Original Research: Open access. "Neurons in the human medial temporal lobe track multiple temporal contexts during episodic memory processing" by Hye Bin Yoo et al. NeuroImage --------------------------------------------------------------------- Abstract See also This is a diagram from the study FeaturedNeuroscienceOpen Neuroscience Articles *November 22, 2021*6 min read Feast or Forage: Study Finds Circuit That Helps a Brain Decide Neurons in the human medial temporal lobe track multiple temporal contexts during episodic memory processing Episodic memory requires associating items with temporal context, a process for which the medial temporal lobe (MTL) is critical. This study uses recordings from 27 human subjects who were undergoing surgical intervention for intractable epilepsy. These same data were also utilized in Umbach et al. (2020). We identify 103 memory-sensitive neurons in the hippocampus and entorhinal cortex, whose firing rates predicted successful episodic memory encoding as subjects performed a verbal free recall task. These neurons exhibit important properties. First, as predicted from the temporal context model, they demonstrate reinstatement of firing patterns observed during encoding at the time of retrieval. The magnitude of reinstatement predicted the tendency of subjects to cluster retrieved memory items according to input serial position. Also, we found that spiking activity of these neurons was locked to the phase of hippocampal theta oscillations, but that the mean phase of spiking shifted between memory encoding versus retrieval. This unique observation is consistent with predictions of the "Separate Phases at Encoding And Retrieval (SPEAR)" model. Together, the properties we identify for memory-sensitive neurons characterize direct electrophysiological mechanisms for the representation of contextual information in the human MTL. Join our Newsletter [ ][ ][SUBSCRIBE] [ ] I agree to have my personal information transferred to AWeber for Neuroscience Newsletter ( more information ) Sign up to receive our recent neuroscience headlines and summaries sent to your email once a day, totally free. We hate spam and only use your email to contact you about newsletters. You can cancel your subscription any time. Tags brain researchentorhinal cortexhippocampusMemoryneurobiology NeuroscienceUT Southwestern Medical Center ShareTweetShareShareSubmit2Email [5f2dac6] Neuroscience News Neuroscience News posts science research news from labs, universities, hospitals and news departments around the world. Science articles can cover neuroscience, psychology, AI, robotics, neurology, brain cancer, mental health, machine learning, autism, Parkinson's, Alzheimer's, brain research, depression and other topics related to cognitive sciences. Related This shows the overlapping outline of a male and female head Study Dispels Harmful Gender Dysphoria Myth This shows a head made up of floating bubbles Schizophrenia: Altered Brain Structural Connectivity and Association With Neurological Soft Signs This shows a child taking a math test Low-Income Kids Use Different Brain Function to Ace Achievement Tests 4 Comments 1. [2e5d2fc9] Satrya Birawan says: December 12, 2021 at 12:22 pm I have twice severe TBI by 2 accidents, both caused lost of memory especially the new one. Fortunately my skill to combine the stored brain data into a novel form that called invention is still working by the unbroken parts. Reply 2. [e4df855c] Francis Amankwaa says: December 7, 2021 at 5:23 am Yeah since too much stress put your heart into a lot of work. Reply 3. [daa281f2] Mario A Rocha says: December 7, 2021 at 4:57 am I am currently dealing with a deranged group of former friends who have sold me out in order to conduct secret mind experimentation for behavior control on women whom they have stalked through the invasion of my bodily privacy. But the initial inquiry stems from 23 years investigating my father, before they ultimately euthanized him nearly to death in 2013. The use of cellular memory is among my many concerns. Reply 4. [1a2b689f] Roberta Hewitt says: December 7, 2021 at 3:56 am I've had epilepsy since i was 18 I'm 34 now I've lost around half my life in memory i don't remember having my first son and when i do remember stuff it's as if it just happenedin the way it feels...but then again i start talking sometimes and start saying stuff i didn't know i knew and i look out up and it's right....weird it seems that i just lost my conscious memory and kept my subconscious memory Reply Leave a Reply Cancel reply Your email address will not be published. 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