Lecture 16.F10

Lecture 16.F10 - Neuroscience 106: Lecture 16 - Motor...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Neuroscience 106: Lecture 16 - Motor Control: Locomotion ANNOUNCEMENTS: 1. Final Exam: A. The final exam will be Thursday, December 9th. B. The final is cumulative with about 65% of the exam from material since the midterm exam and about 35% of the exam from material covered before the midterm. C. The exam will consist of 60 - 80 multiple choice questions and one or two essay questions. Essays will only come from material from the 2 nd half of the course. 2. Read Bear et al. Chapter 14. TODAY'S LECTURE: Locomotion I. What are some simple neuronal mechanisms that can produce patterns of behavior? A. One is a Central Pattern Generator (CPG). 1. The symbol for a CPG is . .. This represents 3 neurons (A, B, C) firing in a cycling pattern. 2. A CPG is a network of neurons that produces rhythmic output by its anatomical and synaptic interactions added to the intrinsic properties of its individual neurons. (spontaneously active neuron(s)). A CPG can generate a complex patterned output even if the CPG is isolated from any patterned input. 3. Below is a diagrammatic example of the firing pattern produced by a CPG: B C A 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
B. Another mechanism for producing behavioral patterns is a Command Neuron . 1. A command neuron is a single neuron that generates a complex behavior by its synaptic effects on the neurons to which it projects. 2. Below is an example of a command neuron: B C A A B C Cycle 1 Cycle 2 Note that B & C alternate, inducing alternating activity of the motor neurons and thus alternating contractions of the muscles. Fast EPSP Slow EPSP Fast IPSP Command Neuron 2
Background image of page 2
3. The different synaptic effects produced by the command neuron can generate different patterns of activity in the α -motor neurons ( α -MN), thus generating a patterned behavior. Note that even though this command neuron secretes one NT, different effects are produced in the recipient cells due to different receptors for the NT. C. Command Group 1. A command group is a set of neurons with similar properties that together generate a complex behavior. That is, a command group does that same thing as a command neuron but consists of multiple neurons. II. Locomotion A. What evidence suggests that mechanisms for locomotion reside in the brainstem and spinal cord and not in the forebrain? The figure below diagrams the main components of the neurocircuitry generating
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/10/2010 for the course CBNS 106 taught by Professor Korzus during the Fall '08 term at UC Riverside.

Page1 / 10

Lecture 16.F10 - Neuroscience 106: Lecture 16 - Motor...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online