PSYC101, Week 3, Biological PSYC: Neuro/Brain
PSYC101, Week 3, Biological PSYC: Neuro/Brain PSYC 101
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This 3 page Class Notes was uploaded by Samantha Wammack on Tuesday September 6, 2016. The Class Notes belongs to PSYC 101 at Boise State University taught by Brian Stone in Fall 2016. Since its upload, it has received 66 views. For similar materials see General Psychology in Psychology (PSYC) at Boise State University.
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Date Created: 09/06/16
Biological PSYC: Neuro/Brain 9-6-16 Nervous System: Network of neurons (nerve cells) sending electro -chemical signals throughout the body Endocrine System: Network of glands sending chemical messages called hormones throughout the body • Hormones travel through bloodstream • Lasts longer than neuron signals Neurons: cells in the nervous system that transmit info. (aka…nerve cells) • Sensory neurons • Motor neurons • Internervous o Enabling communication between sensory or motor neurons and the central nervous system Nervous System Central N.S Peripheral N.S (Brain+Spinal Cord) Somatic N.S (Sensory+Motor) Autonomic N.S Soma=Body (Involuntary) Sympathetic Parasympathetic -Fight or flight -Homeostasis -Arousal -Rest/Relax -Fast heartbeat, slow digestion -Slow heartbeat, fast digestion 1. Input comes into the dendrites. 2. They send info to the cell body (soma) 3. That sends info down the axon and out the terminal button(s) at the end of the axon branches. Neuron • Some axons are covered in myelin sheath which helps signals travel faster • The endings of neurons don’t touch each other…the super small salt- watery space in between is called a synapse. • When a neuron “fires”, it sends an electrical signal down it’s axon to the terminal buttons • There, they release neurotransmitters (chemical messengers) • The neurotransmitters float across the synapse area • Some of those end up fitting into receptors (receive signals that trigger an electrical signal) on the next neurons dendrite. o (Different neurotransmitters only fit into particular receptors ) • Neurotransmitters fit into receptors, which causes ion channels to open in the receiving neurons dendrite. • Drugs often copy the molecular shape of neurotransmitters. “Lock” and “Key” metaphor (Receptor) (Neurotransmitter) • In it’s normal resting state, a neuron has a negative(-) electric charge. • When the ion channels open, It lets in a bunch of sodium (NA+, positive charge) • If enough positive(+) charge builds, the cell “fires”. (AKA…Action Potential) o Nothing happens if there is not enough positive(+) input for an action potential. o The cell does not “fire slightly” or “fire weakly”. o Action potentials are all or nothing. o Strong stimulus à more neurons firing or fire more often (never a “stronger fire”) • The action potential travels down the axon, and at the terminal buttons, that electrical signal causes them to open and release neurotransmitter chemicals. Brain Brain Stem/Cerebellum: Basic life functions such as breathing, sleeping, basic movement Limbic System: (emotions/drive/reward) Amygdala: emotion/fear/rage Hypothalamus: Controls hormones, homeostasis Hippocampus: new memories (think of seeing the hippo walking through campus…that would definitely create a new memory!) Cerebral Cortex: complex stuff…higher thought, perception, skilled action. Made up of 4 “lobes” 3