Research news and applications

A mouse study links gene expression, cell location, and distant connections: rostral Ecel1 cells contribute to induced grooming, while medial Pde11a cells and their pontine projection promote waking.

In mice, central-amygdala SST-labeled cells respond to acute stress, and activation delays sleep onset. Suppression shortens stress-associated sleep latency without significant changes in tested normal-sleep measures.

Whether noise awakens mice depends on intensity and relates to ongoing brain activity; a temporal association cortex–amygdala connection contributes.

What does a mouse do when a companion becomes unresponsive? Researchers observed more than sniffing and grooming: an awake mouse repeatedly pulled the tongue of an anesthetized companion, and the interaction was associated with faster emergence from anesthesia. The finding moves the question from why an animal helps toward how that help takes effect.

Midazolam transiently abolishes the righting reflex and reduces locus-coeruleus activity in mice. Enhancing related noradrenergic signaling shortens recovery, with VLPO α1 receptors contributing.

Rodent experiments link parafacial-zone astrocyte calcium to arousal. Activation increases adenosine signals, with A1 receptors and a sleep-promoting GABA pathway implicated in local waking promotion.

Raphe serotonergic input to VTA can awaken mice from NREM and REM sleep. Downstream mean firing responses differ between states, revealing a diverse rather than uniform recruitment pattern.

Activating central-amygdala GABA-marked cells delays induction and hastens emergence from isoflurane in mice. Their basal-forebrain terminals also promote behavioral and cortical activation.

After mice learn to find food in a maze, brief sleep theta waves accompany reactivation of learning-related ensembles. Suppressing thalamic input to entorhinal cortex weakens reactivation and subsequent spatial-task performance.

A male mouse study compares regional myelin changes: lateral-habenula damage hastens emergence, thalamic paraventricular damage hastens induction, while tested dorsal-raphe timings remain similar.

In mice, activating parabrachial input to a tested extended-amygdala region delays loss of righting and accelerates recovery after anesthetic cessation. Suppression only shortens induction, revealing differences across phases.

In mice, distinct posteroventral medial-amygdala outputs differ in their effects on waking, exposed-space exploration and movement. Repeated sleep deprivation also changes their responses.