lecture_11_06

lecture_11_06 - VII.A.4.b,c Categories of sensory...

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_____ response _____ response tonic phasic Sensory neurons with ______ ___responses continue to fire as long as the stimulus is present. Sensory neurons with _______________ responses fire only when the stimulus is turned on and in some cases also when the stimulus is turned off. Tonic or sustained phasic Neurons at high levels of the brain have developed more complicated schemes including some duration-tuned neurons. VII.A.4.b,c Categories of Can above be a receptor? No, it must be a neuron higher in the brain because receptors don’t fire APs Stimulus Neuronal response or There are many ways neurons can encode the duration of a stimulus. Two ways are described below. A cell’s receptive field (RF) for a parameter is the range of that parameter to which the cell will respond. The concept of a receptive field is perhaps easiest to understand in somatosensation. A sensory cell with its free nerve ending on my finger has a receptive field where? On finger Can it respond to stimuli on my finger? Yes Can it respond to stimuli on my toe? No We will do a little experiment with Rfs. Record from a neuron in somatosensory cortex and find it only responds to stimulation of middle pad of middle finger If we record from that somatosensory cortex neuron and find that it is firing action potentials, what can we conclude? Stimulus on middle pad of the middle finger VII.A.5 The Receptive Field. Human
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This note was uploaded on 11/22/2009 for the course NPB 100 taught by Professor Chapman during the Fall '08 term at UC Davis.

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lecture_11_06 - VII.A.4.b,c Categories of sensory...

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