Topic 2: Neural Foundations Part 2 Flashcards Preview

PSYC 317 Midterm 1 > Topic 2: Neural Foundations Part 2 > Flashcards

Flashcards in Topic 2: Neural Foundations Part 2 Deck (16)
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1
Q

resting potential and membrane potential

A

more positive outside
more negative inside
difference in potential of 70mv

2
Q

chemical gradients

A
more na (sodium) outside
more K (potassium) inside
3
Q

action potentials

A
occur at thresholds of 55 mv 
all or none phenomenon
constant amplitude - 100mv
constant time course - 1 or 2 ms 
followed by refractory period (5 ms)
4
Q

self regenerating propogation

A

action potentials travel down to axons to synapses without losing their strength

5
Q

neurotransmitter
synaptic cleft
receptors

A

signal from pre to post synaptic cell is chemical
gap between pre and post synaptic cell
reception of neurotransmitter by post synaptic cell causes post synaptic potential (PSP)

6
Q

Post synaptic potential

A

originate at synapses
graded (large or small)
propagate electronically to axon hillock
depend on neurotransmitter and receptors

7
Q

EPSP

IPSP

A

increase in positive charge inside the cell

increase the negative charge inside the cell

8
Q

PSP vary in

A

size: how much neurotransmitter and how many receptors
sign: type of transmitter and receptors
speed: ionotropic of metabtropic receptors

9
Q

temporal summation

spatial summation

A

PSPs from different times can sum together at the axon hillock
-PSPs from different synapses sum together at the axon hillock

10
Q

integrate and fire (neural function)

A

the inputs are graded (vary along a continuum)

  • at each point in time, the neuron sums all of its inputs ad fires or not
  • output is all or none
11
Q

center surround receptive field

A

retinal ganglion cells
-on center and off surround
off center on surround
if the light is focused on the on area then there will be firing of the cell - cant cover the whole thing or it will inhibit
emphasize edges to give us info about external environment

12
Q

lateral inhibition

A

inhibits the action of the neighbouring neuron when it itself is excited
-brain pinpoints where the exact stimulus is coming from

13
Q

superior colliculus

A

regulates involuntary eye movements

14
Q

dorsal stream

ventral stream

A

where/how pathway (parietal lobe)

-what/why pathway (temporal lobe)

15
Q

ocular dominance columns

A

stripes when visual field (left and right) overlap

-centre of visual field

16
Q

orientation columns

A

represent light at same locaiton but different orientations