The Brain

Early Brain Psychology 1800’s- German physician Franz Gall invented phrenology. He thought bumps on the skull could reveal mental abilities and character traits Today, neuroscientists study the effect of the brain on behavior.

Neuron- a brain cell

Neuron- a brain cell Dendrites Axon terminal Soma (Cell Body) Nucleus Myelin Sheath

Parts of the neuron Dendrites- receive messages from other cells Cell body (soma)- keeps the cell alive Axon- passes messages from the cell body to other cells Myelin sheath- fatty covering of the axon that speeds up the message Terminal branches- form junctions with other cells

How neurons communicate The dendrites receive a message from another neuron If the dendrites receive enough “yes” signals, the neuron sends an action potential down the axon http://www.brainfacts.org/brain-basics/cell-communication/articles/2015/mysteries-of-the-brain-thinking-brain/

How neurons communicate When the message reaches the terminal branches of the axon, they release a neurotransmitter into the synapse. The neurotransmitter attaches to the appropriate spots in the dendrites of the next neuron. https://www.youtube.com/watch?v=C4Gt322-XxI http://www.youtube.com/watch?v=90cj4NX87Yk&feature=related

Things to know about neurons All or nothing principle- a neuron either fires or does not, no partial response Threshold- the level of stimulation required to trigger a neural impulse

Neurotransmitters Acetylcholine- enable muscle action, learning and memory Dopamine- influences movement, attention, and emotion Serotonin- affects moods and drives Norepinephrine- controls alertness and arousal Glutamate- major excitatory (YES) GABA- major inhibitory (NO)

Endorphins Feel-good neurotransmitters Endogenous “produced within” morphine Released to help reduce pain

Endorphins block pain

https://www.youtube.com/watch?v=3n8UjH9h_8I What can a lack Of Dopamine cause? Parkinson’s Disease

Drugs Blood-brain barrier- a “fence” that keeps unwanted substances from the brain Drugs can either mimic or block the effects of neurotransmitters Mimic- brain may stop producing neurotransmitters Block- the signal doesn’t make it

The Nervous System Organs and glands Muscles Arousing Calming

The Nervous System Central Somatic Peripheral Autonomic Organs and glands Muscles Parasympathetic Sympathetic Arousing Calming

Types of Neurons Sensory- they sense the outside world Motor- they tell the body to move Interneurons- connect sensory and motor neurons What can happen when our motor neurons don’t function properly?: https://youtu.be/Q2Xt4noBVws

Definitions Neural Networks- groups of neurons that work together to perform a function Reflexes- automatic, inborn responses to sensory input

Studying the Brain Electroencephalogram (EEG)- is an amplified recording of electrical waves sweeping across the brain’s surface. Can be measured by electrodes placed on the scalp. PET Scan (positron emission tomography) is a visual display of brain activity that detects a radioactive form of glucose while the brain performs a given task. MRI (magnetic resonance imaging) uses magnetic fields and radio waves to produce computer generated images that distinguish among different types of brain tissue. CT Scan- Computed Tomography- The cross-sectional images generated during a CT scan can be reformatted in multiple planes, and can even generate three- dimensional images. These images can be viewed on a computer monitor, printed on film or transferred to a CD or DVD.

The Brain

Brain Parts Frontal Lobe- thinking and reasoning Parietal Lobe- sensation and spatial thinking Temporal Lobe- hearing Occipital Lobe- sight Cerebellum- “little brain”, coordination and balance Brain Stem- automatic functions such as breathing

Limbic System- basic emotions. *Click on pic

Limbic Parts- Thalamus- sensory control switch Hypothalamus- drives (eating, sleeping, drinking) Hippocampus- memory Amygdala- emotion

Association areas- connections

Association Areas-

Definitions Plasticity- the ability of the brain to change itself Unused areas get taken over and reengineered to do something new Corpus Callosum- the neural fibers that connect the two the halves of the brain

Hemispheres Left Right Right side of Body Speech Rational Thinking Literal Comprehension Left side of Body Emotion Creativity Subtle Inferences

Are you Right/Left Brained? Wagner Preference Inventory

Endocrine System Hypothalamus Pituitary gland  all other glands (esp. adrenal glands)