Lecture 17.Robotics copy

Lecture 17.Robotics copy - Monkey begins to move his arm 2...

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Today’s Lecture We will discuss the motor pathway and then consider something truly remarkable. I will show how scientists are able to “read the mind” and know what someone is about to do even before they do it!!! They can “read the mind” by monitoring the action potentials from the motor cortex of monkeys and men.
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Human Brain has Four Lobes : somatosenory motor Auditory visual
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skin Spinal cord Motor pathway Cerebral hemisphere Brain stem muscle thalamus Somatosensory cortex 1st synapse in medulla Motor cortex skin
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Motoneuron innervates muscle fiber Cortiospinal tract Pyramidal decussation
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Motor homunculus
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microelectrode Neurons in the monkey’s cortex
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In 1982, Apostolos Georopoulos at Johns Hopkins conducted an experiment on behaving monkeys to evaluate how individual neurons in the monkey’s motor cortex code for specific movements that the monkey intends to make. Classic Experiment on the Motor Cortex
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* 1 2 3 2 5 4 3 * * * 5 * Monkey is trained to move her hand in different directions (1-5)
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* 1 2 * * 5 * 1 2 4 * 4 5
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Unformatted text preview: Monkey begins to move his arm 2 3 1 5 4 3 Directio n preferre d direcito n of neuro n begins movme n 1 2 3 4 5 pre f e dire c C Direction 2 preferred direciton of neuron B 1 2 3 4 5 preferred direciton B begins movment 1 2 3 4 5 preferred direciton Direction 3 preferred direciton of neuron A A 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 Neur ons in motor cortex r epr esenting the han d espond b e is moved in a particu dir ection, the neu on s pr eferr ed dir ection begins movment Each time the monkey reaches ferent directi a dif ferent population of neurons in i 5 1 2 3 4 2 3 4 1 5 monkey reaches in direction 3 monkey reach direction 1 population r esponse Neurons whose preferred directio is for postion 3 are maximally exc while neuorns with other preferred respondweakly population esponse Neurons whos is for postion 1 while neuorns w respond we UTUBE movies Mind Control of Prosthetic Hand Remote Control- Center Out Task...
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This note was uploaded on 10/25/2010 for the course BIO 365R taught by Professor Draper during the Spring '08 term at University of Texas at Austin.

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Lecture 17.Robotics copy - Monkey begins to move his arm 2...

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