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Johnson Ying

As seen in: BioRxiv, Cell Press, Cell Reports
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Articles

Optogenetic silencing of medial septal GABAergic neurons disrupts grid cell spatial and temporal coding in the medial entorhinal cortex

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By Jennifer Robinson Verified, Johnson Ying, Michael E. Hasselmo, Mark Brandon
| Cell Reports Verified
Highlights • Medial septum (MS)-GABAergic inhibition reduces theta rhythms • MS-GABAergic inhibition disrupts grid cell spatial periodicity and theta phase precession • Theta rhythm is restored immediately after MS-GABAergic inhibition • Grid cell spatial coding takes longer (60 s) to recover from MS-GABAergic inhibition Summary The hippocampus and medial entorhinal cortex (MEC) form a cognitive map that facilitates spatial navigation.
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Optogenetic Silencing of Medial Septal GABAergic Neurons Disrupts Grid Cell Spatial and Temporal Coding in the Medial Entorhinal Cortex

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By Jennifer Robinson, Johnson Ying, Michael E. Hasselmo, Mark Brandon
| BioRxiv
Abstract The hippocampus and medial entorhinal cortex (MEC) form a cognitive map that facilitates spatial navigation. As part of this map, MEC grid cells fire in a repeating hexagonal pattern across an environment. This grid pattern relies on inputs from the medial septum (MS). The MS, and specifically its GABAergic neurons, are essential for theta rhythm oscillations in the entorhinal-hippocampal network, however, it is unknown if this subpopulation is also essential for grid cell function.
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Path integration in normal aging and Alzheimer’s disease

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By Mark Brandon, Vladislava Segen, Johnson Ying, Erik Morgan
| Cell Press Verified
World Health Organization Ageing and Health. Alzheimer’s Association 2021 Alzheimer’s disease facts and figures. Alzheimers Dement. 2021; 17: 327-406 Lester A.W. et al. The aging navigational system. Neuron. 2017; 95: 1019-1035 Mittelstaedt M.-L. Mittelstaedt H. Homing by path integration in a mammal. Naturwissenschaften. 1980; 67: 566-567 Etienne A.S. Jeffery K.J. Path integration in mammals. Hippocampus. 2004; 14: 180-192 Fyhn M. Spatial representation in the entorhinal cortex. Science.
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