Mock Exam Will

Question 1

A sparse encoding will have a _______ number of neurons active. This will ________ the capacity of the network?

Answer 1

small

increase

Question 2

Consider an experiment with four stimuli; S1, S2, S3 and S4. There are two phases in the experiment. In the first phase S1, S2 and S3 are stimulated and a reward is present. In the second phase S3 and S4 are all stimulated and a reward is present. What is the S3 weight at the end of phase 2?

Answer 2

S3 = 2/3

Question 3

In the Hodgkin Huxley model, which of the gating probabilities has the fastest dynamics, i.e which one will react first to a change in voltage?

Answer 3

m (sodium IN)

Question 4

What are the two main areas of the Hippocampus?

Answer 4

1 - Cornu Ammonis

2 - Dentrate Gyrus

Question 5

The Climbing fibres carry signals from the _______ to the _________.

Answer 5

Inferior Olive to the Purkinje

Question 6

Which type of synapse has a larger time constant?

Answer 6

Inhibitory

Question 7

What are the main roles of the VTA

Answer 7

Cognition, motivation, strong emotions e.g love

Question 8

Where is the VTA located in the brain?

Answer 8

Mid brain, next to the Subsantia Nigra

Question 9

Dopamine is a type of _________, it alters the dynamics of a _________.

Answer 9

Dopamine is a type of Neuromodulator , it alters the dynamics of a Synapse.

Question 10

Short term facilitation can be caused by a build up of ______ ions in the Terminal Bouton.

Answer 10

Calcium

Question 11

An ATP Pase pump means that _______ sodium ions (enter/leave) the cell and _______ potassium (enter/leave) the cell. Resulting in an overall increase/decrease of ___.

Answer 11

3 Sodium OUT
2 Potassium IN
Overall -1

Question 12

A cell typically has a reseting potential of -70mV, this is necessary to stop what from happening?

Answer 12

Stops the ions moving down the concentration gradient.

Question 13

Explain what causes the rising part of the alpha function

Answer 13

Neurotransmitters flood the cleft

Question 14

What type of spike does the climbing fibre carry?

Answer 14

Complex

Question 15

Where is the Basal Ganglia located in the brain?

Answer 15

Center

Question 16

What is the Basal Ganglia connected to?

Answer 16

Cortex

Thalmus

Question 17

Does the Basal Ganglia consist of mainly Excitatory, Inhibitory or a combination of both?

Answer 17

Inhibitory

Question 18

When an axon of cell A is near enough to excite a cell B and repeatedly or persistently takes part in firing it, some growth process or metabolic change takes place in one or both cells such that A’s efficiency, as one of the cells firing B, is increased?

Who said this?

Answer 18

Donald Hebb

Explaining Hebbian Plasticity

Question 19

How does the Hippocampus switch between the learning and retrieval phase?

Answer 19

Higher activity will excite the DG pathway, this is the learning phase.

Question 20

Considering the gating probabilities in the Hodgkin Huxley model:

Voltage increases causing __ to decrease, resulting in the ______ channel closing.

Answer 20

h decreases

sodium channel closes