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Somatosensory Influence on Vertical Vestibulo-Ocular Reflex - new publication by Glasauer and Straka labs
The vestibulo-ocular reflex (VOR) consists of two components, the rotational VOR (rVOR) elicited by semicircular canal signals and the translational VOR (tVOR) elicited by otolith signals. Given the relevant role of the vertical tVOR in human walking, this study aimed at measuring the time delay of eye movements in relation to whole-body vertical translations in natural standing position. Twenty (13 females and 7 males) healthy, young subjects (mean 25 years) stood upright on a motor-driven platform and were exposed to sinusoidal movements while fixating a LED, positioned at a distance of 50 cm in front of the eyes. The platform motion induced a vertical translation of 2.6 cm that provoked counteracting eye movements similar to self-paced walking. The time differences between platform and eye movements indicated that the subject’s timing of the extraocular motor reaction depended on stimulus frequency and number of repetitions. At low stimulus frequencies (<0.8 Hz) and small numbers of repetitions (<3), eye movements were phase advanced or in synchrony with platform movements. At higher stimulus frequencies or continuous stimulation, eye movements were phase lagged by ∼40 ms. Interestingly, the timing of eye movements depended on the initial platform inclination. Starting with both feet in dorsiflexion, eye movements preceded platform movements by 137 ms, whereas starting with both feet in plantar flexion eye movement precession was only 19 ms. This suggests a remarkable influence of foot proprioceptive signals on the timing of eye movements, indicating that the dynamics of the vertical tVOR is controlled by somatosensory signals.
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Spike Afterpotentials Shape In Vivo Burst Activity - new publication by Csordás et al.
Depolarizing afterpotentials (DAPs) are frequently observed in principal neurons from slice preparations of rodent medial entorhinal cortex (MEC), but their functional role in vivo is unknown. Analyzing whole-cell data from mice running on virtual tracks, we show that DAPs do occur during behavior. Cells with prominent DAPs are found in Layer II; their interspike intervals (ISIs) reflect DAP time-scales. In contrast, neither the rarely bursting cells in Layer III, nor the high-frequency bursters in Layer II, have a DAP. Extracellular recordings from mice exploring real 2D arenas demonstrate that grid cells within these three groups have similar spatial coding properties. We conclude that DAPs shape the temporal response characteristics of principal neurons in MEC with little effect on spatial properties.
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Subpolulations of Place Fields - new publication by Haas et al.
Olivia V Haas, Josephine Henke, Christian Leibold, Kay Thurley
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Symposium: Biophysics of perception, October 23, 2017
Mechanisms, neuronal information processing, and behavioral response
Located in News / BCCN Munich News
Talking Science with Adrienne Fairhall - November 25-26
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Talking Science with Christof Koch - December 20-21
www.talking-science.de
Located in News / BCCN Munich News
Talking Science with Matteo Carandini - December 12-13
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Towards improved cochlear implants - new publications by Hemmert lab
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Tuft dendrites of pyramidal neurons - new publication by Eberhardt et al.
Located in News / BCCN Munich News
Valentino Braitenberg Award for Computational Neuroscience - Call for Nominations
Located in News / Bernstein Network News