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0This research identifies histaminergic neurons in the hypothalamus as the primary drivers of infraslow brain dynamics that regulate how memories are accessed from moment to moment. By monitoring mice, scientists discovered that spontaneous activity in these cells tracks an integrated brain-body state, predicting whether a subject will successfully recall a learned association. High levels of pre-cue activity act as a priming mechanism, preparing the basolateral amygdala to produce a robust neural response to environmental triggers. Conversely, suppressing these neurons through optogenetic inhibition hinders memory expression, while activating them enhances the ability to discriminate between important cues. These findings suggest that fluctuations in memory, such as the "tip-of-the-tongue" phenomenon, are not random noise but are governed by specific chemical circuits. Ultimately, the study reveals that the histamine system serves as a vital gatekeeper for cognitive readiness and state-dependent retrieval.
References:
Morishita Y, Takamura Y, Nishimura K, Yokoi Y, Ishihama Y, Idutsu R, Ono M, Matsumoto R, Hitora-Imamura N, Minami M, Nomura H. Infraslow histaminergic dynamics govern priming states to gate moment-to-moment memory accessibility. Neuron. 2026 Jun 11:S0896-6273(26)00411-3. doi: 10.1016/j.neuron.2026.05.019. Epub ahead of print. PMID: 42276055.
