Researchers have discovered how to store diverse forms of artificial short-term memories - in isolated brain tissue.
Memories are often grouped into two categories: declarative memory, the short and long-term storage of facts like names, places and events; and implicit memory, the type of memory used to learn a skill like playing the piano. In the study, researchers sought to better understand the mechanisms underlying short-term declarative memories such as remembering a phone number or email address someone has just shared.
Using isolated pieces of rodent brain tissue, the researchers demonstrated that they could form a memory of which one of four input pathways was activated. The neural circuits contained within small isolated sections of the brain region called the hippocampus maintained the memory of stimulated input for more than 10 seconds. The information about which pathway was stimulated was evident by the changes in the ongoing activity of brain cells.
"This is the first time anyone has found a way to store information over seconds about both temporal sequences and stimulus patterns directly in brain tissue," says Ben W. Strowbridge, PhD, Professor of Neurosciences at Case Western. "This paves the way for future research to identify the specific brain circuits that allow us to form short-term memories."
"The type of activity we triggered in isolated brain sections was similar to what other researchers have demonstrated in monkeys taught to perform short-term memory tasks," according to Robert A. Hyde, a fourth year MD/PhD student. "Both types of memory-related activity changes typically lasted for 5-10 seconds."
The researchers also demonstrated that they could generate memories for specific contexts, such as whether a particular pathway was activated alone or as part of a sequence of stimuli to different inputs. Changes in ongoing activity of hippocampal neurons accurately distinguished between two temporal sequences, akin to humans recognizing the difference between two different song melodies. The artificial memories Strowbridge's group created in the hippocampus continued to recognize each sequence even when the interval between stimuli was changed.
The new research expands upon a previous study, also published in Nature Neuroscience in 2010, in which Strowbridge's group found that isolated pieces of the hippocampus could store which one of two inputs was stimulated.
That study also found that a relatively rare type of brain cell, originally described in the 1800's by the famous Spanish anatomist Santiago Ramón y Cajal, but ignored in modern times, played a critical role in the memory effect.
By demonstrating that the same neural circuits also can store information about context, the new study will likely increase the focus on these potential "memory cells" in the hippocampus, called semilunar granule cells, says Strowbridge. Understanding normal memory function also lays the groundwork for understanding how neurodegenerative diseases, such as Alzheimer's or Parkinson's disease, affect memory and for developing new, more effective treatments for memory impairments associated with aging.
Paper: "Mnemonic Representations of Transient Stimuli and Temporal Sequences in Rodent Hippocampus In Vitro," Nature Neuroscience
- PHYSICAL SCIENCES
- EARTH SCIENCES
- LIFE SCIENCES
- SOCIAL SCIENCES
Subscribe to the newsletter
Stay in touch with the scientific world!
Know Science And Want To Write?
- Muslim Hijab Linked To Less Negative Body Image Among Women
- Tax And Spend Policies Could Make You Eat Healthier
- Neil Tyson On The Politics Of Science Denial
- Corals: Not So Passive, They Are Nature's Tiny Engineers
- Double Mastectomy Doesn't Bring Better Breast Cancer Survival Rates Over Lumpectomy
- Mutating Ebola Viruses Not As Scary As Evolving Ones
- Created: Renewable Propane Using E.coli
- "I have no obsession with Oz. What I do have is an absolute disdain for the supplements industry..."
- "Dude what you just wrote there is like saying that any of the numerous quantities in standard QFT..."
- "There are multiple multiplications. If we represent these using the 4x4 gamma matrices then..."
- "You are wrong for the same reason he is. You are confusing the Hilbert space with the space..."
- "Really? I will strike the above comment but not erase it. In the above you say..."
- Protein in plasma may one day change transfusions
- Maternal low protein diet promotes diabetic phenotypes in offspring
- Study indicates that the hippocampus mediates cognitive decline in Huntington's disease
- Discharged patients return to the ER because 'better safe than sorry'
- NASA satellites calling here you come again, Tropical Storm Dolly