03.24 - Ross - Sensory

03.24 - Ross - Sensory - Lecture 1 Sensory Receptors 1...

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Unformatted text preview: Lecture 1 Sensory Receptors 1 Sensory Systems 2 Receptor specificity 3 Labeled Line Theory 4 Typical peripheral sensory receptor 5 Model of a mechanoreceptor 6 Increase in channel openings generates a graded receptor potential 7 Larger receptor potential leads to a higher firing rate Figure 10-7: Sensory coding for stimulus intensity and duration Webers Law: S/S constant; S=incremental sensitivity S=response level threshold threshold The firing rate encodes the stimulus magnitude 9 10 Tactile mechanoreceptors Comparison of different touch receptors 12 Threshold sensitivity of some receptors is frequency dependent 13 Frequency dependence of Pacinian corpuscle is due to the shell 14 Receptive field of a Meissner corpuscle in the finger 15 Receptive Fields Receptors with large fields Receptors with small fields 16 Different receptor types sense different aspects of the stimulation pattern 17 The skin is covered with overlapping receptive fields 18 warm receptor cold receptor Sensitivity of receptors to small changes in temperature 19 Small myelinated A fibers Unmyelinated C fibers Stimulus (cold probe) Temperature sensitivity of skin receptors 20 TRP receptors underlie temperature sensitivity VR-1 (one kind of TRP) receptor responds to heat and capsaicin...
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03.24 - Ross - Sensory - Lecture 1 Sensory Receptors 1...

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