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Articles by Brice Bathellier
Designer indicators for two-photon recording of subthreshold voltage dynamics
Abstract Subthreshold voltage dynamics are essential for neuronal information integration, yet they remain technically challenging to measure in vivo. While genetically encoded voltage indicators are emerging as powerful tools for voltage recording, they lack the sensitivity to detect millivolt-scale subthreshold fluctuations with two-photon microscopy—the method of choice for deep-tissue recording.
Chronically implantable μLED arrays for optogenetic cortical surface stimulation in mice - Nature Communications
Abstract Cortical implants are a proven clinical neurotechnology with the potential to transform our understanding of cognitive processes. These processes rely on complex neuronal networks that are difficult to selectively probe or stimulate. Optogenetics offers cell-type specificity, but achieving the density and coverage required for chronic, high-resolution modulation remains a challenge.
The Geometry of Layer 2/3 Cortical Sound Processing in Slow Wave Sleep
1 Introduction Sleep is characterized by reduced motor activity, decreased behavioral responsiveness, and an absence of memorization of external stimuli, which are often interpreted as a sensory disconnection of the brain from the environment.[1-3] Several neural mechanisms have been proposed to explain this disconnection, including a gating of sensory information by the thalamus based on its reduced activity, burst mode dynamics, and the occurrence of sleep spindles.[4] However, cortical...
Noisy neuronal populations effectively encode sound localization in the dorsal inferior colliculus of awake mice
Request a detailed protocol A custom sound-attenuating chamber was incorporated to the microscope/electrophysiology setup, allowing only the objective or cables to access the inside, to attenuate room and microscope scanner noise reaching the mouse. All possible sound reflecting surfaces were lined with 1-cm or 0.5-cm-thick foam to preserve free-field conditions.
Massive perturbation of sound representations by anesthesia in the auditory brainstem
Abstract Anesthesia modifies sensory representations in the thalamo-cortical circuit, but is considered to have a milder impact on peripheral sensory processing. Here, tracking the same neurons across wakefulness and isoflurane anesthesia, we show that the amplitude and sign of single neuron responses to sounds are massively modified by anesthesia in the cochlear nucleus of the brainstem, the first relay of the auditory system.
Noisy neuronal populations effectively encode sound localization in the dorsal inferior colliculus of awake mice
Abstract Sound location is proposed to be encoded by neuronal population activity patterns at the central nucleus of the mammalian inferior colliculus (CNIC). However, the underlying neuronal population code at the single-trial basis remains unclear due to the absence of large-scale simultaneous recordings. Moreover, population coding of sound location is relatively understudied at other relevant subdivisions of the mammalian inferior colliculus (IC) such as the dorsal cortex (DCIC).
Noisy neuronal populations effectively encode sound localization in the dorsal inferior colliculus of awake mice
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Deep imaging in the brainstem reveals functional heterogeneity in V2a neurons controlling locomotion
Abstract V2a neurons are a genetically defined cell class that forms a major excitatory descending pathway from the brainstem reticular formation to the spinal cord. Their activation has been linked to the termination of locomotor activity based on broad optogenetic manipulations. However, because of the difficulties involved in accessing brainstem structures for in vivo cell type–specific recordings, V2a neuron function has never been directly observed during natural behaviors.
An elaborate sweep-stick code in rat barrel cortex
Abstract In rat barrel cortex, feature encoding schemes uncovered during broadband whisker stimulation are hard to reconcile with the simple stick-slip code observed during natural tactile behaviors, and this has hindered the development of a generalized computational framework.
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