Updated March 6th, 2026
Research Spotlight
Noor Fatima and Ghulam Nabi, from the University of Engineering and Technology, Lahore, explored whether there is a link between sound-evoked brain activity and cognitive states in people. The researchers developed a way to recognize individual people, whether they were processing a sound in their native tongue, and how sound was delivered to these individuals. According to the researchers, this approach may improve brain-based identification systems while tracking how people process sounds cognitively.
Presbycusis is a prevalent form of age-related hearing loss that also hinders speech recognition. While scientists have linked hearing loss to an increased risk of cognitive decline, the biological “bridge” between the two has remained unclear. Researchers at Tiangong University and Shandong Provincial Hospital, led by Ning Li, explored the link between these symptoms in people. The researchers identified a specific neurobiological link between hearing loss and cognitive decline called the Functional-Structural Ratio (FSR). They found that the putamen and fusiform gyrus (involved in processing sound and speech) and the precuneus and medial superior frontal gyrus (involved in memory and decision-making) become less connected to functional brain networks in those with presbycusis. These reduced connections to networks were directly associated with worse hearing thresholds and poorer performance on memory and executive function tests. According to the authors, these findings suggest that hearing loss involves a coordinated decline in both brain structure and function, which may contribute to the symptoms of the disorder. Says Li, “The most important takeaway is that preserving hearing health may protect brain integrity. Because changes in the FSR correlate with both hearing loss and cognitive decline, this ratio could eventually serve as a biomarker—a tool for doctors to identify who is at the highest risk for dementia simply by looking at their brain scans.”
Behavioral, electrophysiological, and pharmacological evidence points to a role for serotonin modulation of striatal circuits in the brain. Ng et al. use in vivo calcium imaging to understand how serotonin signaling influences the dorsomedial striatum (DMS) during action and waiting behaviors. The authors show that serotonin signaling through the serotonin 1B receptor can have different effects on medium spiny neurons (MSNs) in the DMS depending on the ongoing behavior—increasing MSN activity during rewards and decreasing MSN activity during inhibition. These data show that serotonin effects on striatal circuitry are complex and can be dependent on behavioral context.
Most-Discussed Research Published in January and February
Below are five Early Release articles that generated the most online discussion in January and February of 2026, as measured by Altmetric. Altmetric data is available for all articles published in eNeuro on the Info & Metrics tab. Learn more about how the Altmetric score is calculated.
This study reveals that age-related hearing loss (presbycusis) involves coupled structural atrophy and functional decline in key brain regions like the fusiform gyrus and putamen. We introduce the functional-structural ratio (FSR) as a novel biomarker showing that reduced brain functional-structural coupling correlates with both worsening hearing thresholds and cognitive impairment. This provides the first direct neurobiological evidence linking hearing loss to cognitive decline via shared neural reorganization. FSR offers a potential tool for early screening and monitoring of dementia risk in presbycusis, highlighting that preserving hearing health may protect brain integrity. These findings advance our understanding of how sensory decline drives neurodegeneration.
A Common Iba1 Antibody Labels Vasopressin Neurons in Mice
Microglia are the primary immune cells of the brain and are involved in many neurodevelopmental, as well as neurodegenerative, processes, thus making the study of microglia an important area of neuroscience research. There are a wide array of antibodies available to label microglia. Specific detection of microglia using immunohistochemistry is crucial for understanding differences in cell density, morphology, and interactions with other cells in various contexts. In the present study, a common anti-Iba1 antibody made in goat was found to display erroneous labeling of vasopressin neurons in specific regions of the mouse brain, inconsistent with other microglial markers, which emphasizes the importance of validating antibody efficacy and specificity in a region- and species-specific manner prior to beginning experimental data collection.
An Open-Source Restraint System for Magnetic Resonance Imaging in Awake Rats
Most rodent fMRI studies, including awake studies, rely on anesthesia, which profoundly alters brain activity and limits the interpretation of the data. This study presents a novel restraint system that enables high-quality fMRI in fully awake rats, eliminating the need for anesthesia, ear bars, and bite bars. By reducing motion, this simple restraint system allows for investigation of neural activity and connectivity without confounds from sedation or anesthesia. Its open-source, modular design supports behavioral tasks and broad accessibility, making it a valuable tool for neuroscience research seeking to bridge the gap between preclinical imaging and real-world brain function.
Vestibular dysfunction poses a major medical challenge, with significant consequences for balance, spatial orientation, and quality of life. While regenerative therapies targeting hair cell (HC) repair offer promise, the minimal structural requirements for restoring normal vestibular functions remain unclear. Through an innovative methodology that combines precise vestibulo-ocular reflex (VOR) quantification and region-specific analyses of HC loss in mice, we demonstrate a nonlinear relationship between structural integrity and functional recovery. Our findings establish critical thresholds of HC preservation, ∼50% for minimal vestibular function and over 80% for normal function. These insights provide valuable benchmarks for translational research, refining therapeutic strategies for vestibular pathologies and advancing our understanding of population-coding mechanisms.
When Familiar Faces Feel Better: A Framework for Social Neurocognitive Aging in a Rat Model
Social behavior is a critical yet underexplored component of cognitive aging. While both human and animal studies report age-related narrowing of social networks, the behavioral and neurobiological underpinnings remain unclear. Using a well-powered rat model, here we demonstrate preserved sociability in aging alongside marked individual differences in social novelty preference. A subset of aged rats preferred familiar over novel conspecifics, resembling patterns observed in older humans and nonhuman primates. Social phenotypes were independent of hippocampal-dependent memory, suggesting a dissociation between these aging outcomes. This dissociation was further validated using transcranial magnetic stimulation, supporting the notion of distinct underlying neurobiological mechanisms. Collectively, the findings lay a powerful foundation for advancing the translational neurobiology of social behavior in cognitive aging and reserve.
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