Bobble-head doll syndrome (BHDS) is a rare entity, characterized by antero-posterior head bobbing, which is of the type "yes-yes." Less frequently, having a head movement of the type "no-no" is described. We report an unusual case of an 80-year-old man with a cystic mass of the lamina quadrigemina, extending to the posterior fossa. We conclude that ventriculocystocisternotomy associated with a cystoperitoneal shunt is an effective treatment for a symptomatic giant arachnoid cyst in the lamina quadrigemina.
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Midbrain encodes sound detection behavior without auditory cortex.
Elife
December 2024
Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, United Kingdom.
Hearing involves analyzing the physical attributes of sounds and integrating the results of this analysis with other sensory, cognitive, and motor variables in order to guide adaptive behavior. The auditory cortex is considered crucial for the integration of acoustic and contextual information and is thought to share the resulting representations with subcortical auditory structures via its vast descending projections. By imaging cellular activity in the corticorecipient shell of the inferior colliculus of mice engaged in a sound detection task, we show that the majority of neurons encode information beyond the physical attributes of the stimulus and that the animals' behavior can be decoded from the activity of those neurons with a high degree of accuracy.
View Article and Find Full Text PDFProtocol for identifying sound-activated neurons in the inferior colliculus by cFos immunostaining.
STAR Protoc
December 2024
Centre for Discovery Brain Sciences, University of Edinburgh, Edinburgh EH8 9XD, UK; Simons Initiative for the Developing Brain, Patrick Wild Centre, University of Edinburgh, Edinburgh, UK. Electronic address:
cfos is an immediate early gene commonly used to identify neuronal activation. After loud sound stimulation, neurons in the inferior colliculus are activated and cFos is expressed in the nucleus. Here, we present a protocol for quantifying neuronal activity in response to auditory stimulation using cFos immunostaining in the mouse inferior colliculus.
View Article and Find Full Text PDFNoisy neuronal populations effectively encode sound localization in the dorsal inferior colliculus of awake mice.
Elife
November 2024
Cell Biology and Biophysics Unit, European Molecular Biology Laboratory, Heidelberg, Germany.
Sound location coding has been extensively studied at the central nucleus of the mammalian inferior colliculus (CNIC), supporting a population code. However, this population code has not been extensively characterized on the single-trial level with simultaneous recordings or at other anatomical regions like the dorsal cortex of inferior colliculus (DCIC), which is relevant for learning-induced experience dependent plasticity. To address these knowledge gaps, here we made in two complementary ways large-scale recordings of DCIC populations from awake mice in response to sounds delivered from 13 different frontal horizontal locations (azimuths): volumetric two-photon calcium imaging with ~700 cells simultaneously recorded at a relatively low temporal resolution, and high-density single-unit extracellular recordings with ~20 cells simultaneously recorded at a high temporal resolution.
View Article and Find Full Text PDFA novel three-dimensional method for detailed analysis of RGC central projections under acute ocular hypertension.
Exp Eye Res
January 2025
Department of Ophthalmology & Visual Science, Eye & ENT Hospital, Shanghai Medical College, Fudan University, Shanghai, 200032, China; State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai, 200031, China; NHC Key Laboratory of Myopia and Related Eye Diseases, Chinese Academy of Medical Sciences, and Shanghai Key Laboratory of Visual Impairment and Restoration (Fudan University), Shanghai, 200032, China. Electronic address:
Normal perception of visual information relies not only on the quantity and quality of retinal ganglion cells (RGCs), but also on the integrity of the visual pathway, within which RGC central projection predominates. However, the exact changes of RGC central projection under particular pathological conditions remain to be elucidated. Here, we report a whole-brain clearing method modified from iDISCO for 3D visualization of RGC central projection.
View Article and Find Full Text PDFMicroseconds-level coding of echo delay in the auditory brainstem of an FM-echolocating bat.
J Neurophysiol
December 2024
Department of Neuroscience, Brown University, Providence, Rhode Island, United States.
Echolocating big brown bats () detect changes in ultrasonic echo delay with an acuity as sharp as 1 µs or less. How this perceptual feat is accomplished in the nervous system remains unresolved. Here, we examined the precision of latency registration (latency jitter) in neural population responses as a possible mechanism underlying the bat's hyperacuity.
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