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Neurons are not the only players implicated in memory-related processes. Mouse studies suggest that astrocytes can participate in memory circuits, while separate experiments point to chemical signals that alter memory-related activity in cultured cells and at neuronal connections. These findings add possible mechanisms to the picture, but they do not reveal one universal missing piece or explain how human memory works in full.
What could “the missing piece” mean?
Memory is often described through neuronal engrams: groups of neurons whose activity is associated with an experience and can contribute to recalling it. Recent findings broaden that account by examining other parts of memory-related processes, including astrocytes, the timing of chemical stimulation, and chemical changes to proteins at neuronal connections.
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Those lines of work measure different things. A mouse freezing response, a gene response in cells grown in a laboratory, and protein changes at neuronal connections are not interchangeable evidence of memory. They may help researchers investigate how memories form or are retrieved, but none alone completes an explanation of human memory.
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What the mouse study examined
A Baylor College of Medicine account of a Nature study published in 2024 describes fear-conditioning experiments in mice. Researchers identified a subset of astrocytes that expressed c-Fos during learning and were physically close to neuronal engram cells. They reported that these learning-associated astrocytes were functionally coupled with the corresponding neuronal ensemble.
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What happened when researchers altered the astrocytes
Activating an astrocyte ensemble stimulated synaptic activity or communication in its associated neuronal engram. In a different context, activating that ensemble could prompt freezing behavior, a recall-related response in the experiment. The researchers also found elevated NFIA in astrocytes activated during learning. Preventing those astrocytes from producing NFIA suppressed recall of the associated memory, while the mice could still recall other memories.
The results support a role for astrocyte ensembles in memory-circuit function and retrieval in mice. They do not show that astrocytes independently contain a complete memory, or establish that the same effects occur in people.
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Can cells outside the brain respond to learning-like signals?
A 2024 study reported in Nature Communications examined human cells grown in a laboratory: one type derived from nerve tissue and another from kidney tissue. Researchers exposed the cells to chemical-signal patterns modeled on neurotransmitter activity. The cells were engineered to produce a glowing protein when a memory-associated gene was active.
When the same treatment was delivered as spaced pulses rather than all at once, the gene response was stronger and lasted longer. This is evidence that cultured cells can respond differently to the timing of chemical stimulation. It is not evidence that kidney-derived cells have consciousness, autobiographical memories, or human-like recall. The study’s result is a molecular response in cells, not a demonstration of whole-organism memory.
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How might lipid signals affect neuronal connections?
A University of Queensland report dated 18 June 2025 describes mouse research on DDHD2, an enzyme that releases the saturated fatty acid myristic acid. The researchers reported that myristic acid chemically tags proteins at neuronal connections. Blocking this signaling pathway in mice prevented protein changes associated with memory formation.
A separate University of Queensland report from 6 February 2024 discussed PLA1 and STXBP1, which researchers linked to the formation and targeting of saturated fatty acids during neuronal communication. In mouse models lacking the PLA1 gene, saturated free fatty-acid levels were lower before memory impairment appeared. The authors interpreted this as evidence that the enzyme and fatty acids have a role in memory acquisition.
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These findings concern specific biochemical pathways in mouse research. They do not show that dietary fatty acids act as memory supplements, so they are not a basis for changing diet to improve memory.
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What do these findings establish—and what remains open?
Together, the studies suggest that memory-related activity may involve more than neuronal engrams alone: astrocytes may participate in mouse memory circuits, chemical pulse timing can shape a gene response in cultured human cells, and lipid signaling can affect protein changes associated with memory formation in mice. The experiments do not establish how much these mechanisms contribute to everyday human memory, whether they interact as part of one system, or whether any will lead to a safe treatment.
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The University of Queensland says clinical applications for the lipid-pathway findings are still a long way off. More broadly, the studies described here do not demonstrate a way to control human memory. The useful conclusion is narrower: researchers have identified additional cellular and chemical processes worth investigating, not a solved theory of memory.
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