Unmasking the CA1 ensemble place code by exposures to small and large environments: more place cells and multiple, irregularly arranged, and expanded place …

…, HY Kao, SA Neymotin, A Olypher… - Journal of …, 2008 - Soc Neuroscience
In standard experimental environments, a constant proportion of CA1 principal cells are
place cells, each with a spatial receptive field called a place field. Although the properties of …

Attention-like modulation of hippocampus place cell discharge

…, J Bureš, B Poucet, RU Muller, AV Olypher - Journal of …, 2010 - Soc Neuroscience
Hippocampus place cell discharge is an important model system for understanding cognition,
but evidence is missing that the place code is under the kind of dynamic attentional control …

Properties of the extra-positional signal in hippocampal place cell discharge derived from the overdispersion in location-specific firing

AV Olypher, P Lánský, AA Fenton - Neuroscience, 2002 - Elsevier
There is a good deal of evidence that in the rodent, an internal model of the external world
is encoded by hippocampal pyramidal cells, called ‘place cells’. During free exploration, the …

Cognitive disorganization in hippocampus: a physiological model of the disorganization in psychosis

AV Olypher, D Klement, AA Fenton - Journal of Neuroscience, 2006 - Soc Neuroscience
Cognitive coordination refers to processes that organize the timing of activity among neurons
without altering individual discharge properties. Coordinating processes allow neural …

Quantifying location-specific information in the discharge of rat hippocampal place cells

AV Olypher, P Lánský, RU Muller, AA Fenton - Journal of neuroscience …, 2003 - Elsevier
The informational content in the location-specific discharge of rat hippocampal cells is usually
quantified by an average for the entire behaviorally accessible space. In contrast to such ‘…

Using constraints on neuronal activity to reveal compensatory changes in neuronal parameters

AV Olypher, RL Calabrese - Journal of Neurophysiology, 2007 - journals.physiology.org
In this study, we developed a general description of parameter combinations for which
specified characteristics of neuronal or network activity are constant. Our approach is based on …

Geometry and dynamics of activity-dependent homeostatic regulation in neurons

AV Olypher, AA Prinz - Journal of computational neuroscience, 2010 - Springer
To maintain activity in a functional range, neurons constantly adjust membrane excitability
to changing intra- and extracellular conditions. Such activity-dependent homeostatic …

Hybrid systems analysis of the control of burst duration by low-voltage-activated calcium current in leech heart interneurons

A Olypher, G Cymbalyuk… - Journal of …, 2006 - journals.physiology.org
The leech heartbeat CPG is paced by the alternating bursting of pairs of mutually inhibitory
heart interneurons that form elemental half-center oscillators. We explore the control of burst …

Measuring the quality of neuronal identification in ensemble recordings

SA Neymotin, WW Lytton, AV Olypher… - Journal of …, 2011 - Soc Neuroscience
Technological advances in electrode construction and digital signal processing now allow
recording simultaneous extracellular action potential discharges from many single neurons, …

On the location-specific positional and extra-positional information in the discharge of rat hippocampal cells

AV Olypher, P Lánský, AA Fenton - Biosystems, 2002 - Elsevier
The informational content in the location-specific discharge of rat hippocampal cells is usually
quantified by an average for the entire experimental space. In contrast, in the present work …