Neuronal Dynamics: Electrical and Chemical Signals in the Nervous System, Study notes of Military Strategy and Training

Download Neuronal Dynamics: Electrical and Chemical Signals in the Nervous System and more Study notes Military Strategy and Training in PDF only on Docsity! 1 Overview of Neuronal Dynamics Basic Features of Nervous System Organization 2 c. elegans 302 neurons (32 chemosensory) 7000 synaptic connections nerve net in hydra 1011 neurons 1015 synapses 5 ( ) tdtt T tf Tt t n i i i ′∫ ∑ −′∆ = ∆+ =1 1 )( δ encoding: mean firing rate ∆T ti ti+1 Whole Cell Recording in Brain Slice Thalamocortical Neurons Have Two Firing Modes 6 7 • biophysics of single neurons • interactions between neurons Neuronal Dynamics: electrical and chemical signals Encoding: how are sensory stimuli, motor control commands, memory, reward represented in these signals Neural Computation: coding + dynamics Eye Fixation During Spontaneous Horizontal Eye Movements 10 Neural Dynamics During Integration (ring network) persistent pattern of activity that “rotates” to new position with integration of vestibular head velocity signals firing ratepreferred head angle 11 Eye Fixation Head Direction Cells Neural Signal: action potential Encoding: mean firing rate encodes motor command (eye position) or “computed” head direction in laboratory frame of reference Dynamics: Persistent Neural Activity 0 kHz 10 kHz A New Form of Neural Dynamics During Acoustic Sequence Production zebrafinch (Fee) 12 Neurons In RA Show Complex Burst Patterns During Acoustic Sequences Bursts Reproducible Under Linear Time Warp 15 A P E X B A S E RIGHT P C LOB E 1 00 µm BANDS OF LABELED NEURONS AFTER LEARNING TRAVELING WAVE OF NEURAL ACTIVITY Limax Procerebral Lobe Central Pattern Generators Olfactory Systems Neural Signal: action potential/ sub-threshold membrane potential Encoding: CPGs: muscle tension for rhythmic contractions, olfaction? Dynamics: Oscillation (.7 Hz -100 Hz) 16 noise, fluctuation