Lecture 3: Brain Flashcards Preview

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Flashcards in Lecture 3: Brain Deck (33):
0

Why is it important to study biological behaviour?

Our sensory processes make up our knowledge of our environment
We use our brain circuitry to think, reason and learn
We should understand what makes each person a unique individual

1

What parts of the brain are we interested in?

Limbic system
Cerebral cortex
Thalamus
Hypothalamus
Cerebellum
Brain stem
Spinal cord

2

What does the limbic system do?

Regulates emotions and motivated behaviour

3

What does the cerebral cortex do?

It is involved in complex mental processes

4

What does the thalamus do?

Relays sensory info

5

What does the hypothalamus do?

Manages the body's internal states

6

What does the cerebellum do?

Regulates coordinated movement (balance)

7

What does the brainstem do?

Sets the brain's general alertness level and warning system

8

What does the spinal cord do?

It provides a pathway for neural fibres travelling to and from the brain

9

What are the two components of the autonomic nervous system and what are their roles?

Sympathetic nervous system: fight or flight response, emergency system

Parasympathetic nervous system: rest and digest, vegetative functions

The two systems act in opposition to control heart rate and act in concert to control sexual reflexes

10

What are the major neurotransmitters of focus in this course?

Glutamate
GABA
Dopamine
Serotonin
Acetyl hone
Endorphins and enkephalins
Epinephrine and norepinephrine

11

What does glutamate do?

Excitation of neurons throughout the nervous system

12

What does GABA do?

Inhibits neurons in the brain

13

What does dopamine do?

Involved in emotional arousal, pleasure, reward, voluntary movement and attention

14

What does serotonin do?

Sleep and emotional arousal, aggression, pain and mood regulation

15

What does acetylcholine do?

Learning and memory

16

What do endorphins and enkephalins do?

Pain relief and elevation of mood

17

What does epinephrine and norepinephrine do?

Emotional arousal, anxiety and fear

18

What are the steps of neural transmission?

Neurotransmitters in the axons of a neuron are stored in synaptic vesicles waiting to be stimulated by an action potential which causes their release

The action potential stimulates the release of neurotransmitters across the synapse

The neurotransmitters bind to the receptor sites on the dendrites of the next neuron, resulting in a change in potential

19

What are some further important functions of the cerebral cortex.

Provides flexible control of patterns of movement
Permits subtle discrimination among complex sensory patterns
Makes possible symbolic thinking

Organisation: primary and association areas

20

What happens if the frontal love is destroyed?

The ability to plan, limit impulses and reasoning are also destroyd

21

Which tasks are associated with the frontal lobe?

Skilled movements, emotion, behaviour, awareness, memory, smell

22

What tasks are associated with the temporal lobe?

Hearing

23

What tasks are associated with the parietal lobe?

Body sensations

24

What tasks are associated with the occipital lobe?

Visual recognition, vision

25

What tasks are associated with the cerebellum?

Balance and muscle coordination

26

What is between the frontal and parietal lobes?

Motor cortex (next to frontal lobe) and sensory cortex (between motor and parietal)

27

What is the endocrine system and what is its function?

A collection of glands that release hormones into the bloodstream (pituitary, thyroid, adrenal, ovaries/testes)
They send global messages to the bloodstream

28

What is the role of the pituitary gland?

Initiation of puberty
Regulation of endocrine glands
Sends growth hormones
Causes adrenal gland to release adrenaline,
thyroid to release thyroxin
Testes to release testosterone,
Ovaries to release progesterone and estrogens

29

What are the key facts regarding brain development?

At birth, brain is almost adult size
90% of adult brain weight is achieved by 2-6 years old
Advances: cerebellum, reticular function, corpus callosities
Cerebral cortex: consists of 85% brain weight and is the last to stop growing

30

What are the sensitive periods of development?

Stimulation vital during growth spurts (from infancy to early adulthood)
Experience wires a child's brain growth
Under-stimulation impairs development
Too much sensory info can overwhelm children.

31

What is the general trend of brain plasticity in humans?

Plasticity increases from2-8 months, and declines until 10-20
It then rises a little, and slowly declines through to 70 years of age

32

What is the effect of prenatal exposure to alcohol and other drugs?

Baby is born very preterm or very small as shown by MRI