Early Brain Psychology 1800s- 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 Dendrites Soma (Cell Body) Nucleus Axon Myelin Sheath Axon terminal 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 axong/brain-basics/cell- communication/articles/ 2015/mysteries-of-the- brain-thinking-brain/g/brain-basics/cell- communication/articles/ 2015/mysteries-of-the- brain-thinking-brain/ How neurons communicate https://www.youtube.co m/watch?v=C4Gt322-XxI https://www.youtube.co m/watch?v=C4Gt322-XxIm/watch?v=90cj4NX87Y k&feature=relatedm/watch?v=90cj4NX87Y k&feature=related 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. 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? Parkinsons 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 doesnt make it The Nervous System Muscles Organs and glands Arousing Calming The Nervous System Muscles Organs and glands 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 dont 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 brains 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 Limbic Parts- Thalamus- sensory control switch Hypothalamus- drives (eating, sleeping, drinking) Hippocampus- memory Amygdala- emotion Association areas- connections 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)