Lecture 25: Network integration

Question 1

What are the main excitatory neurotransmitters?

- cause depolarisation = EPSP’s (excitatory post-synaptic potential)

Answer 1

=Acetylcholine Ach - at the nerve & muscle

= Glutamate - brain

Question 2

What are the inhibitory neurotransmitters?

- cause hyperpolarisation = IPSP’s (inhibitory post-synaptic potential)

Answer 2

= GABA - brain

Question 3

What is summation?

Answer 3

when local potentials add together at the axon hillock and result in an AP being initiated and transmitted down the axon hillock

Question 4

What are the two types of summation?

Answer 4

Spatial summation - lots of axon at the same time

Temporal summation - one axon fires frequently

Question 5

What is temporal summation?

Answer 5

Occurs when ONE axon terminal stimulates the post-synaptic membrane MULTIPLE TIMES and rapidly
-frequency of AP

Question 6

What is spatial summation?

Answer 6

Occurs when SEVERAL axon terminals stimulate the post-synaptic membrane at the SAME TIME

Question 7

What happens in the convergence neural network?

Answer 7

Info from different points converges to excite a single point
- redundancy and control points

Question 8

What happens in the divergence neural network?

Answer 8

Info from a single point diverges - amplified

- single point amplification and control points