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iGluSnFR4f and iGluSnFR4s are the latest generation of genetically encoded glutamate sensors. They are advantageous for detecting rapid dynamics and large population activity, respectively, as demonstrated in a variety of applications in the mouse brain.

The International Brain Laboratory presents a brain-wide electrophysiological map obtained from pooling data from 12 laboratories that performed the same standardized perceptual decision-making task in mice.

Brain-wide recordings in mice reveal that prior expectations are distributed through recurrent loops across all levels of cortical and subcortical processing.

UnitMatch tracks neurons in electrophysiological recordings across multiple recording sessions. UnitMatch relies on the spike waveform and allows tracking neurons even when their functional properties change such as during memory formation.

Lightning Pose is an efficient pose estimation approach that requires few labeled training data owing to its semi-supervised learning strategy and ensembling.

Simultaneous mapping of activity across the cortex and dorsal striatum in mice shows that activity in each part of the striatum precisely mirrors that in topographically associated cortical regions, consistently across behavioural contexts.

DREDge is a software tool for motion correction of high-density electrophysiology recordings. It can handle action potential or local field potential data and is demonstrated on a variety of acute or chronic recordings from humans, nonhuman primates and mice.

Noel et al. show aberrant updating of expectations in three distinct mouse models of autism spectrum disorder. Brain-wide neurophysiology data suggest this stems from excess units encoding deviations from prior mean and a lack of sensory prediction errors in frontal areas.

Transplanted rod precursor cells restore visual function, from electrophysiology to behaviour, after transplantation into a mouse model of congenital night blindness.

Increases in synaptic inhibition have been proposed to underlie divisive normalization in distal neural networks. Here, using optogenetic stimulation and intracellular recordings in mouse visual cortex, the authors argue that normalization is a result of a decrease in synaptic excitation.

Focal cortical seizures result from local and widespread propagation of excitatory activity. Here the authors employ widefield calcium imaging in mouse visual areas to demonstrate that these seizures start as local synchronous activation and then propagate along the connectivity that underlies normal sensory processing.

Normalization computes a ratio between the response of an individual neuron and the summed activity of a pool of neurons. Here, the authors review the evidence that it serves as a canonical computation — one that is applied to processing different types of information in multiple brain regions in multiple species.

Exploring the relationship between population coupling and neuronal activity reveals that neighbouring neurons can differ in their coupling to the overall firing rate of the population, the circuitry of which may potentially help to explain the complex activity patterns in cortical populations.

Feedback influence from a higher visual area to primary visual cortex in mice engages nonlinear dendritic integration.

The mechanistic link between cortical activity and behaviors remains largely unclear. Here authors show that targeted holographic photostimulation of mouse visual cortex during a detection task alters performance based on the animal’s state and visual stimulus conditions, highlighting the dynamic influence of cortical activity on perception and behavior.

A modular architecture for managing and sharing electrophysiology, behavior, colony management and other data has been built to support individual laboratories or large consortia.

Transplantation of healthy photoreceptor cells has been shown to rescue blindness. Here, the authors show that rather than donor cells integrating into the host retina, the predominant mechanism underlying this rescue involves exchange of cytoplasmic material between donor and host cells in vivo.

Silicon microelectrodes are a powerful technique for recording neuronal population activity. Increases in probe size and density make for larger recordable populations, but also require new techniques for processing the resulting data. The authors describe a suite of practical, open source software for spike sorting of large, dense electrode arrays.

Harris and Shepherd review our knowledge of input and output patterns for different classes of cortical cells. They propose that cortex, like other parts of the body, has a serially homologous organization, featuring area- and species-specific variations on a basic theme, that allows different types of function to emerge.