Human memory manages to separate the original state of a neighborhood construction site, the active work phase, and the final finished building without mixing them up by utilizing a specific region of the hippocampus known as the dentate gyrus. Researchers at the Institute of Neurosciences—a public research center run by the Spanish National Research Council (CSIC) and Miguel Hernández University—published these findings in the journal PLOS Biology, identifying how a specific type of neuron inhibits neighboring cell activity to incorporate new experiences.
How Hippocampal Neurons Control Memory Formation
The Neural Network Plasticity laboratory at the research center focused its investigation on the dentate gyrus, a section of the hippocampus dedicated to generating new memories. Inside this region, specialized cells suppress the activity of other neurons to help the brain record fresh experiences without corrupting older recollections. Laboratory experiments on mice demonstrated that altering this inhibitory process directly changes how recall functions. When researchers lowered inhibition levels below normal, test subjects displayed behavior consistent with enhanced memory retrieval and much more detailed recollection of past events.
Reduced inhibitory activity helps capture fine details
Lower inhibition is not universally beneficial for all cognitive functions, according to the computational model used by the research team. When memory load is light, reduced inhibitory activity helps the brain capture fine details. However, that advantage disappears once the volume of information increases substantially. Depending on task demands and contextual importance, the dentate gyrus can either open up to accept new inputs or strengthen existing memories to resist interference from fresh stimuli. Encarni Marcos, co-lead of the study and head of the research line at the IN CSIC-UMH, noted that a dynamic mechanism adjusts this operational mode through cellular inhibition.
Study examines dentate gyrus neurons in mice
What specific part of the brain does the study examine?
The research focuses on the dentate gyrus, which is a region located within the hippocampus devoted to generating new memories.
How was the experiment conducted?
Scientists carried out tests on mice by altering the inhibitory processes of specific neurons within the dentate gyrus to observe how varying those levels affected memory retrieval.
Where was the research published?
The findings were published in the scientific journal PLOS Biology by researchers from the Institute of Neurosciences, a center run by the Spanish National Research Council and Miguel Hernández University.
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