Sensory

Question 1

What is the principle of labeled lines

Answer 1

Each “modality”( each sensation) has specialised receptors that send info to the brain on separate lines: each receptor sends its own separate action potential directly to the brain

Question 2

What defines primary sensory cortex?

Answer 2

The place in the brain where the sensory input coming from receptors accross the body first arrives - thus “primary”

Question 3

Fancier name for receptors that gather sensory info (3 words)

Answer 3

Sensory Receptor Organs (lol I knoww I tricked you)

Question 4

How do you call the “translation” receptors do from external stimulus (whether mechanical, visual, phonic tor other) to a potential? (2 words, intials ST)

Answer 4

Sensory Transduction

Question 5

What do you call the potential created by sensory transduction of a receptor

Answer 5

Receptor or Generator potential

Question 6

Does an action potential increase in voltage at the increase of its triggering stimulus? (yes, no and what happens instead if you say no)

Answer 6

No, but the rate of firing of the single neuron and the quantity of firing neurons increases

Question 7

Name of example receptor (two words, PC - non il partito comunista, no)

Answer 7

Pacinian Corpuscule

Question 8

Which two aspects does coding convey?

Answer 8

Intensity and Location of the stimulus

Question 9

How is the Intensity of the stimulus coded

Answer 9

With the rate of firing and the quantity of firing neurons (rate coding)

Question 10

How is the Location of the stimulus coded

Answer 10

With the mapping of receptor-corrispondent cells at each level of each sensory pathway (think about the homunculus) - example: dermatomes for the somatosensory system

Question 11

What is range fractation?

Answer 11

It’s the “specialisation” of certain neurons to detect certain fractions of the intensity range. They achieve this through lower or higher thresholds that allow them to be more or less sensitive to stimuli .

Question 12

What’s the fancy name for neurons that re more or less sensitive to stimuli depending on their threshold? (two words, initials RF)

Answer 12

Range Fractionation

Question 13

General path of a sensory stimulus (name the 5 steps)

Answer 13

1. input from receptors and sensory transduction
2. spinal chord - entry of the central nervous system
3. brainstem
4. thalamus
5. primary sensory cortex and secondary sensory cortex

Question 14

What are the two types of mediation of sensory stimuli?

Answer 14

1. adaptation

2. suppression

Question 15

What does adaptation consist of?

Answer 15

Even if the stimulus remains constant, along time the receptor will fire at an increasingly lower rate.

Question 16

What does suppression consist of? (2 aspects)

Answer 16

a. Mechanical control - structures that regulate sensory input such as eyelids
b. Top-down inhibition - from the central system to the receptors.