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The brainThe brainand and
LearningLearning
Some trivia• Each and every second of your life
several billion bits of information pass through your brain.
• Messages within your brain travel through trillions of neural connections at speeds up to 250 miles per hour.
Wow!• Our Average brain
capacity is approximately ten million volumes (books) of a thousand pages each!
Another view of the brain
The Hindbrain
The Brain Stem - the entry point for sensorimotor information.
Medula Oblongata - controls heart rate and respiration
Pons - regulates breathing
The Hindbrain• Reticular Activating System - • Regulates the amount and
flow of sensorimotor information
• Relays information to the thalamus in the forebrain
• Emotionally charged - it shuts down the cerebral cortex & instinct and training take over. Relaxed -cortext returns to function
The Hindbrain
• Cerebellum• 1/10 of the brain by volume
with 1/2 of its neurons.• Controls movement and
balance• Allows memory formation• Muscle memory - procedural
memory• Autonomic memory (facts -
alphabet, math facts)• Stimulus/response effects• Filters & integrate incoming
data for decision making
The Midbrain
• Controls eye movement and constriction of the pupils
• Many limbic functions occur here - these supercede other parts of the brain and connect memory and emotional structures.
• The Limbic System• Thalamus - receives
sensory information from the RAS (reticular activating system).
• Communicates with the pituitary gland in the endocrine system (chemical).
• Keeps the brain updated on the outside world
• Hypothalamus• Relays info from within
the body to the brain• Regulates temperature• Regulates sexual
function & appetite control
• Connected to pituitary gland which runs the endocrine system (chemical).
• Amygdala• Controls emotional memory• Screens for importance for
long term storage• Remembers how you feel
about what you see• STRESS RESPONSE can
interfere with thalamus - send message to hypothalamus-go to pituitary-causing a chemical reaction and interfere with thought processes.
TEST! How did you react!
Forebrain - Cerebral Cortex
• “Top layer” covering the cerebrum
• Folded - unfolded it would be the size of a table cloth
• Gyri are the bumps, sulci are the grooves and allow for a larger cerebral cortex area
• Newest evolutionary part of the brain- locus of thinking, planning, problem solving, organizing
The lateral sulci divides theLeft & right hemispheres!
The Cerebrum
• Lies under the cerebral cortex
• White matter consists of axons, possibly myelinated, of the cerebral cortex (more about this later!)
• Part where thought & higher function lie.
• Divided into 2 hemispheres.
• The “bridge” that Connects the left and right hemispheres
• A wide, flat bundle of neurons which allows the two hemispheres to communicate.
The Lobes1. Frontal lobe
2. Occipital lobe
3. Parietal Lobe
4. Temporal lobe• Motor strip• Sensory strip
• Anterior area of critical thinking, problem solving, planning, decision making.
• Posterior premotor area - modifies movements, motor area - produces movements
• Left frontal lobe - Broca’s area, an important area for language.
• In 1861 Dr. Paul Broca described a patient who had lost the ability to speak except to say the word “tan” . When the patient died Broca examined the brain and found damage to the left cerebral hemisphere.
• Integrates sensation and perception information to form a single perception (cognition)
• Constructs the spatial coordinate system - body image and placement and spatial relations.
• Damage of left parietal lobe can disrupt spoken/written language.
• The sensory motor cortex lies between the frontal and parietal lobes.
Sensory controls feeling
• Controls hearing, speech, learning, memory
• Discriminates sounds and smells
• Sorts new information and responsible for short term memory
• Left temporal lobe - contains verbal memory(words, names)
• Wernicke’s Area• Right temporal lobe - contains
visual memory (pictures/faces)
• In 1874 Karl Wernicke noticed damage to another region of the cortex. If this was damaged the patient can hear language and when they speak it sounds natural, but what they say has no meaning.
Hippocampus
• Hippocampus• In the medial temporal
lobe• Stores factual
memories - remembers what you see, hear,
etc.)• From here they can go
to permanent (long term memory)
• This area process visual information, visual reception, visual recognition of shapes and colors.
A word from our visual specialists.
Pineal gland & Pituitary gland• Pituitary gland -• Runs the endocrine
system and adjust the body’s chemistry
• Pineal gland• Regulates the release of
neuro transmitters to regulate sleep
• Releases melatonin in darkeness for sleep and regulates circadian rhythms (think jet lag!)
More on these later!
Neurons!
• Carry the messages of the brain
• Axon - carry the messages
• Dendrites - receive the messages
• Synapse - break from axon of one neuron to dendrite of next. Path of the electrical charge
Neurons!
• Glial cells - nurturing cells for the neurons (think Einstein!). More action of a neuron, the more glial cells it needs
• Myelin - fatty substance which coats the neuron’s axons. It insulates and promotes the travel of transmissions
• Nerve - a bundle of neurons• Neural network - a chain of
neurons from originating sight to memory.
• Neurotransmitters are the chemicals that carry
information in the synapse from one neuron to another
• They are receptor specific• Excitatory neurotransmitters
cause the next neuron to fire• Inhibitory neurotransmitters
stop the next neuron from firing.
• If a neuron receives a message repeatedly the
connection is strengthened.
Glutamate & GABA
• Both are amino acids used in information processing transmissions.
• Glutamate is an excitatory and is important in learning and memory.
• GABA (gama aminobutyric acid) is an inhibitory. It quiets neurons that are not needed. – Low GABA + low seratonin can = violence and agression.– High GABA + high seratonin can = passive
behavior.
Monoamines
• Epinephrine - adrenaline = ACT!
• Norepinephrine - gets the brain’s attention.
• Helps establish the synapses which fix information into long term memory.– High levels can cause agression.– Release in arousal explains recall of
information related to shock, fright, anger.
Monoamines
• Dopamine - controls physical movement and regulates the flow of information in higher levels of the brain.– Low levels affect working memory.– High levels cause euphoria.
Melatonin• Melatonin is the “sleep”
neurotransmitter.• It is released in the pineal gland in the
forebrain.• It activates our biological clocks - our
Circadian Rhythms.• (Think about jet lag!)
During sleep, information we have learnedthat day becomes organized in ourbrains.
Emotion
drives
Attention
drives
Learning
Creating Memory
Sight
Sound
Smell
Taste
Touch
R E C E P T O R S
Attention
Short-
Term
Memory
(working
Brain)
Forgotten
REHEARSAL
Long-termMemory
Elaboration
Retrieval
Primary - Recency Effect
Prime - Time
Down
Time
Prime - Time
Learn BEST--
the FIRST
Learn LEAST--
just Past the Middle
Learn NEXT--
the LAST
“M-Space”The capacity of short-term memory appears to develop with age. The number of spaces increases by one unit every other year beginning at age three.
15 13
11
9
7
5
Plus or minus 2
Average Retention Rates
Lectures --5%
Reading --10%
Audio-Visual --20%
Demonstration --30%
Discussion Group --50%
Practice by Doing --75%
Teach OthersImmediate Use of Learning --90%
Joyce & Showers(2002)