Question

Describe and give examples of mono-synaptic and oligo-synaptic reflexes. (4)

What is an H-reflex? (2) Given an application (2).

What evidence do we have that the brain uses inverse models for control of movement? (6)

Do we need an “inverse model” to do a task described by Fitt’s law? Why? (5)

Answer 1

1)Monosynaptic reflexes are those kind of reflxes which includes only two neurons(one afferent sensory neuron and one motor neuron)

Examples of monosynaptic reflexes are

Patellar reflex and Achilles reflex.

2) On the other hand oligosynaptic reflexes are those kind of reflxes that includes more than one synapses.

Example includes synapses involved in the inhibition of alpha motor neuron of the antagonistic muscle.

3) H- reflex is actually the refectory reaction of muscles that is initiated after the electrical stimulation applied to thier sensory fibers of the respective innervating nerve of that musle.

Application of it is includes the study of conduction of the proximal segments of the peripheral nerves.

4) inverse action by brain is thought to control desire action by appropriate motor command.

Like for the eye movements.

5) fitt's law predicts the time to move rapid towards target is the ratio of the distance of the target and the width of that target

So we definitely need a inverse model to do a task described by fitt's model.