Brain Region Helps Hold Memory, Mouse Study Finds
Mice with disrupted claustrum activity showed about half the working memory performance of controls, a finding not yet tested in people.
Updated on Nov. 6, 2026 in Alzheimer’s
Researchers at the University of Geneva (UNIGE) found that the claustrum, a thin structure deep in the brain, helps maintain working memory in mice. Temporarily reducing activity of claustrum neurons cut the mice's working memory performance in half, according to a study published in Nature Communications on 14 October 2026.
Why it matters
Working memory is the short-term system that lets people hold information long enough to compare it, manipulate it, and act on it, and it is affected in many cognitive conditions. Identifying a brain region that supports this function gives researchers a new target for understanding how these abilities break down, though the work so far is in mice and does not yet translate to people.
The study used controlled experiments in mice, using optogenetics to switch claustrum neuron activity on or off at precise moments during a task requiring the animals to compare two stimuli separated by a waiting period. Disrupting the structure cut working memory performance in half, and the effect held for both smell and touch and regardless of when during the wait the disruption occurred.
The players
University of Geneva (UNIGE)
A Swiss research university whose neuroscience teams study brain circuits underlying memory, perception, and cognition.
The details
The claustrum is connected to almost all regions of the cortex, which is why researchers examined it as a possible influence on information drawn from very different networks. Using optogenetics, which makes selected neurons responsive to light delivered through an optical fiber, the team could briefly alter claustrum activity while each mouse held a smell or touch in mind. Live recordings showed a trace of the initial stimulus persisted through the waiting period, and disrupting the claustrum impaired the use of that held information without affecting perception itself.
Timeline
The study was published in Nature Communications on 14 October 2026.
Health Landscape
Working memory deficits are a feature of conditions such as schizophrenia and ADHD, which the researchers cite as possible long-term relevance for this work. Optogenetics has become a standard tool for dissecting which brain regions drive specific behaviors, and this study adds the claustrum to the set of structures being mapped for cognitive function.
For now, this is early basic research in mice, so it does not change any screening, treatment, or self-care recommendation. If you notice persistent trouble holding information in mind, it is worth raising with your doctor, who can assess memory concerns in context.
The takeaway
Working memory depends on a brain region that had received little attention, which makes the claustrum a new area to watch in cognitive research. Keep in mind that these results come from mice, and any human relevance will need to be tested before it shapes care.
Further reading
For more on how memory systems decline in the brain, explore our Alzheimer’s coverage.
Source note: This article includes information reported by SciTechDaily.
