🔎 Unit 1: Scientific Foundations of Psychology
1.0Unit 1 Overview: Scientific Foundations of Psychology
1.1Introducing Psychology: The Historical Progression of Psychology
1.2Research Methods in Psychology
1.3The Experimental Method
1.5Statistical Analysis in Psychology
🧠 Unit 2: Biological Bases of Behavior
2.0Unit 2 Overview: Biological Bases of Behavior
2.1Interaction of Heredity and Environment
2.3Overview of the Nervous System and the Neuron
2.7Tools for Examining Brain Structure and Function
2.8The Adaptable Brain: Neural Fluidity
👀 Unit 3: Sensation and Perception
3.0Unit 3 Overview: Sensation and Perception
3.1Principles of Sensation
3.2Principles of Perception
3.5Auditory Sensation and Perception
📚 Unit 4: Learning
4.0Unit 4 Overview: Learning
🤔 Unit 5: Cognitive Psychology
5.0Unit 5 Overview: Cognitive Psychology
5.1Introduction to Memory
5.5Forgetting and Memory Distortion
5.6Biological Bases of Memory
5.7Introduction to Thinking and Problem Solving
5.8Biases and Errors in Thinking
5.9Introduction to Intelligence
5.10Psychometric Principles and Intelligence Testing
👶 Unit 6: Developmental Psychology
6.0Unit 6 Overview: Developmental Psychology
6.1The Lifespan and Physical Development in Childhood
6.2Social Development in Childhood
6.3Cognitive Development in Childhood
6.5Adulthood and Aging
🤪 Unit 7: Motivation, Emotion, & Personality
7.0Unit 7 Overview: Motivation, Emotion, and Personality
7.1Theories of Motivation
7.2Specific Topics in Motivation
7.3Theories of Emotion
7.4Stress and Coping
7.5Introduction to Personality
7.6Psychoanalytic Theories of Personality
7.7Behaviorism and Social Cognitive Theories of Personality
7.8Humanistic Theories of Personality
7.9Trait Theories of Personality
🛋 Unit 8: Clinical Psychology
8.0Unit 8 Overview: Clinical Psychology
8.1Introduction to Psychological Disorders
8.2Psychological Perspectives and Etiology of Disorders
8.3Neurodevelopmental and Schizophrenic Spectrum Disorders
8.4Bipolar, Depressive, Anxiety, and Obsessive-Compulsive and Related Disorders
8.5Trauma- and Stressor Related, Dissociative, and Somatic Symptom and Related Disorders
8.6Feeding and Eating, Substance and Addictive, and Personality Disorders
8.7Introduction to Treatment of Psychological Disorders
8.8Psychological Perspectives and Treatment of Disorders
8.9Treatment of Disorders from the Biological Perspective
👫 Unit 9: Social Psychology
9.0Unit 9 Overview: Social Psychology
9.1Attribution Theory and Person Perception
9.2Attitude Formation and Attitude Change
9.3Conformity, Compliance, and Obedience
9.4Group Influences on Behavior and Mental Processes
9.5Bias, Prejudice, and Discrimination
9.6Altruism and Aggression
🧐 Multiple Choice Questions (MCQ)
✍️ Free Response Questions (FRQ)
⏱️ 4 min read
November 11, 2020
Neurons are our body’s nerve cells which make up the nervous system. For a neuron to fire, or communicate with another neuron, information must first be gathered in by the dendrites of the receiving neuron. From there, the information passes through the cell body to the axon.
|Part of the Neuron||Function|
|Dendrite||Receives information📖 and transfers it to the cell body|
|Cell Body||The neuron's support center❤️|
|Axon||Passes messages to its terminal branches. The neural impulse goes through the axon and is an electrical signal⚡|
|Myelin Sheath||A layer of tissue that covers the axon and speeds up neural impulses. Without a myelin sheath, there is a loss of muscle control💪|
|The Axon's Terminal Branches||Pass on chemical messages✉️ to other cells and parts of the body|
Image Courtesy of Open Source Textbook
Action potential must occur for the message to continue to travel down the axon. This only occurs if the neuron’s threshold has been met - meaning it has received enough stimulation🔋 from the original sending neuron. If this threshold is met, the action potential occurs and the message travels down the axon via a process of depolarization. If the threshold is not met, nothing happens. Neurons have an all-or-none response - they either fire or they don’t.
Basically, the action potential is associated with depolarization. Depolarization is the process that carries the neural impulse through the axon, action potential is what must happen for the process to occur.
There are two types of signals / neurotransmitters:
Excitatory -- Pushes neuron's "accelerator"🚦; makes a neuron more likely to reach action potential and fire
Inhibitory -- Pushes a neuron's "break"🛑; makes it less likely for a neuron to reach action potential
Once the message has passed through the axon, it reaches the terminal branches. The terminal branches of a neuron contain neurotransmitters which are then released. These neurotransmitters cross the synaptic gaps between neurons and are gathered in by dendrites of a new neuron, continuing the communication process📩
Image Courtesy to Wikipedia
The synapse is where two neurons meet and neurotransmitters are released into it. There is both an electrical synapse, which relays quick🐆 messages to another cell, and a chemical synapse, which sends messages slowly🦥 to another cell.
Neurotransmitters are stored in vesicles in the axon terminal. When there is a neural impulse, the vesicle binds with the edge of the axon terminal and the neurotransmitters are released into the synaptic cleft.
Neurotransmitters that do not find a home on the dendrites of a neuron are absorbed back into the original neuron through a process called reuptake.
Neurotransmitters often act as agonists or antagonists in our body. An antagonist neurotransmitter binds to the dendrites of a neuron and prevents or blocks🙅 its response. An example of this is the poison, Botulin. Botulin causes paralysis because it blocks the release of acetylcholine, an important neurotransmitter in muscle action.
Agonists, on the other hand, bind to receptor sites and mimic the effects of a specific neurotransmitter. Opiates are an example of an agonist as they mimic the effects of endorphins in our body (which is why they produce a morphine-like effect).
Drugs trick our brains into thinking that they are neurotransmitters. As mentioned above, drugs mimic the effects of endorphins so much to the point that our brain stops producing natural endorphins. This is why there is such a withdrawal when people stop trying to take drugs💊. The brain of a long-term drug user just cannot produce something significant for your health anymore because of the way drugs trick our brain.
Here is a chart of the functions of some key neurotransmitters. It is good to memorize this since it is sometimes tested on.
|Neurotransmitter||Function||Examples of Malfunctions|
|Acetylcholine (ACh)||Enables muscle action, learning, and memory.||With Alzheimer's disease, ACh-producing neurons deteriorate.|
|Dopamine||Influences movement, learning, attention, and emotion.||Oversupply --> schizophrenia Undersupply --> tremors and decreased mobility in Parkinson's disease|
|Serotonin||Affects mood, hunger, sleep, and arousal.||Undersupply --> depression. Antidepressant drugs raise serotonin levels|
|Norepinephrine||Helps control alertness and arousal||Undersupply can depress mood.|
|GABA||A major inhibitory neurotransmitter||Undersupply --> seizures, tremors, and insomnia.|
|Glutamate||A major excitatory neurotransmitter; involved in memory||Oversupply --> over stimulates the brain --> migraines and seizures (why lots of people avoid MSG in their food)|
Table and Content Courtesy of Myers' Psychology for AP - 2nd edition
After a neuron fires and reaches action potential, it goes into its refractory period, where it cannot fire. This period of rest😴 prevents one signal from combining with another.
Then, the neuron reaches the resting potential, where the cell is polarized and ready to fire again once it reaches threshold.
🎥Watch: AP Psychology - Neurons and Neurotransmitters
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