R5 Questions

Question 1

State Hebb’s rule.

Answer 1

When two neurons fire and send impulses at the same time, the synapses between them strengthen, causing learning to occur.

Question 2

Field’s argues that changes at the level of the synapse do not suffice to create memories (T/F).

Answer 2

True

Question 3

_____________ is a fatty substance that insulates axons and speeds neural transmission by 50 to 100%.

Answer 3

Myelin

Question 4

All types of __________ respond to neural activity and can modify information transmission in the brain.

Answer 4

glial cells

Question 5

Which two types of cells are involved in wrapping axons with myelin?

Answer 5

1. the oligodendrocytes (for the brain & spinal cord or CNS)

2. the Schwann cells (in limbs & trunk/torso or PNS)

Question 6

Roughly speaking, how does “learning” in white matter affect the way a neuron operates?

Answer 6

It controls the speed of the impulses from other neurons that arrive at their destination. More myelinations could be added to the axons, or thinned, which would control the rate of which the impulses travel down the axons.

Question 7

The thickness of the myelin sheath on an axon is not fixed. Instead, it involves a dynamic balance between 2 things- what are they?

Answer 7

the new layers next to the axon and the removal of the outer layer that is under control of the astrocyte

Question 8

_________________ act like bioelectric repeaters to relay an electrical impulse from node

Answer 8

The nodes of Ranvier

Question 9

Self-generated (or internally generated) brain waves, consisting of oscillations waves of different frequency serve to ……

Answer 9

sweep the brain