AP Psychology Unit 1 Biological Bases of Behavior - Elrod

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AP Psychology Elrod Unit 2 Test Study Guide

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167 Terms

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Nature vs. Nurture

Evolutionary Perspective

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Central Nervous System

  • Brain and Spinal cord

  • Carries messages to the brain

  • Sends messages from the brain

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Pheripheral Nervous System

  • Nerves not encased in bone

  • divided into somatic and autonomic

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Somatic Nervous System

  • Controls voluntary muscle movements

  • recieves messages from motor cortex

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Autonomic Nervous System

  • controls automatic functions of the body (heart, lungs, organs, glands, etc.)

  • controls our response to stress

  • divided into 2 (sympathetic and parasympathetic)

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Sympathetic Nervous System

  • Fight or Flight or Freeze Response

  • mobilizes our body to respond to stress

  • accelerates some functions but conserves resources needed for a quick response by slowing down some functions

  • speeds up: heart rate & breathing

  • dilates: pupils

  • Slows down: digestion

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Parasympathetic Nervous System

  • Responsible for slowing down our body after a stress response

  • Homeostasis

  • The brake pedal that slows down the body’s autonomics nervous system

  • slows down: breathing, heart rate

  • constricts: pupils

  • speeds up: digestion

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Reflexes

  • information is controlled by the spine & does not require the brain to respond

  • Work differently from the normal nervous system transmission

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Brain (matching)

Responsible for transmitting information throughout the body

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Central Nervous System (matching)

Responsible for cognitive functioning

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Spinal Cord (matching)

Responsible for sending messages to and from the brain

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Pheripheral Nervous System (matching)

Responsible for all nervous system functions outside of the brain and spinal cord

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Somatic Nervous System (matching)

Responsible for voluntary movement

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Autonomic Nervous System (matching)

Regulates heart rate, breathing, digestion, etc.

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Sympathetic Nervous System (matching)

spends reserved energy

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Parasympathetic Nervous System (matching)

Restores & repairs spent energy

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Neurotransmitters

determine what type of signal is being sent

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Synapse

space between neurons where neurotransmitters travel through via, receptor sites

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Dendrites

where signals are recieved

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Neurons

Carry messages using electrical impulses

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Glial Cells

Provide physical & chemical support of neurons

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Types of Neurons

  • Afferent (Sensory)

  • Interneurons

  • Efferent (Motor)

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Afferent (Sensory) Neurons

  • take infro from the senses and outside world to the brain

  • Part of PNS

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Interneurons

  • Once information comes from the senses, takes info to different parts of the body

  • Part of CNS

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Efferent Neurons

  • Take information from the CNS to muscles

  • Part of PNS

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Mnemonic device for Neurons

Think SA/ME (Sensory=Afferent/Motor=Efferent)

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Neural Firing

Electrochemical Process

  • Electrical inside the neuron

  • chemical outside the neuron (neurotransmitters)

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Resting Potential

When a neuron is “charged” but waiting for the next action potential

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Threshold

the minimum level of stimulation needed to activate a neuron and create an action potential

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Action Potential

  • All or nothing process

  • when a neuron sends information down an axon, away from the cell body

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Refractory Period

If a neuron fires, it has to go through a resting period before it can fire again

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Neurotransmitters

chemical messengers that move between neurons

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Types of Neurotransmitters

  • Excitatory

  • Inhibitory

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Excitatory Neurotransmitters

  • make it more likely the next neuron will fire

  • chemical secreted at terminal button that causes the neuron on the other side of the synapse to generate an action potential (to fire)

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Inhibitory Neurotransmitters

  • make it less likely the next neuron will fire

  • chemical secreted at terminal button that reduces or prevents neural impulses in the postsynaptic neuron

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Hormones

can act similarly to neurotransmitters

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Types of Outside Influence (Nurture) on Neural Firing

  • Agonists

  • Antagonists

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Agonists

Blocks re-uptake/excites (SSRIs)

  • stimulants

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Antagonists

Blocks release/inhibits next neuron from firing

  • pain reliever

  • depressants

  • hallucinogens

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Divisions of the Brain (vertical-top to bottom)

  • Forebrain

  • Midbrain

  • Hindbrain

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Divsions of the Brain (lateral)

Connected by Corpus Collosum

  • Left Hemisphere

  • Right Hemisphere

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Lateralization

Specialization

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Higher up in the the vertical ordering in the brain

= higher function (typically)

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Functions controlled by Left Hemisphere

  • Verbal Memory

  • Speech

  • Rational Symbolic Thought

  • Superior Language Comprehensions

  • Feeling shapes with right hand

  • Right hand motor control

  • Hearing vocal sounds

  • Vision (right field)

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Functions controlled by Right Hemisphere

  • Musical Ability

  • Hearing Non-Vocal Sounds

  • Limited language comprehension

  • Memory for shapes

  • Left hand motor control

  • Feeling shapes with left hand

  • Intuitive, non-verbal thought

  • Superior recognition of faces & spatial relationships

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Lobes of the Cerebral Cortex

  • Frontal

  • Temporal

  • Parietal

  • Occipital

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Methods of Studying the Brain

  • Accidents (Case Studies)

  • Lesions (Lobotomies)

  • Electroencephalogram (EEG)

  • Functional MRI

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Electroencephalogram

Detects and Investigates brainwaves & consciousness

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Functional MRI

Allows us to see the structure of the brain & what parts are active

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Split Brain Research (Gazzaniga & Sperry Study)

  • patients had severed corpus collosum

  • depending on which side of the brain the word was flashed on, the patient responds by saying or drawing it

  • Because the 2 sides of the brain aren’t connected or able to work together, the responses are isolated by side (ex. can draw the word but can’t say it)

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Brain Plasticity

  • Developing Neural pathways/networks

  • Strengthening/weakening neural connections

  • Lateralization and specialization can change

  • Depends on age

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Sleep

  • State of consciousness (just less aware)

  • Part of the natural circadian rhythm

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Circadian Rhythm

  • Awake & sleep cycle

  • Body naturally changes with the rhythm

  • Hormones (melatonin) and brain waves

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Stages of Sleep

  • Awake

  • Awake and Relaxed

  • Stage 1 (N1)

  • Stage 2 (N2)

  • Stages 3 & 4 (N3)

  • REM Sleep

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Awake

Beta waves

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Awake & Relaxed

Alpha waves

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Stage 1 (N1) - Between Awake & Asleep

  • Only occurs once

  • Theta waves

  • Hypnogogic sleep

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Stage 2 (N2)

  • Theta waves but slower

  • Sleep spindles & k-complexes

  • Possibly important for memory consolidation (not 100% sure)

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Stages 3 & 4 (N3)

  • Deepest sleep

  • Delta waves

  • Important for physical & hormonal health

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REM Sleep

  • Most Conscious

  • Most likely to remember dreams

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Sleep & Dreams

  • Dream in different stages

  • Most likely to remember dreams in REM sleep

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Theories of Dreams

  • Activation-Synthesis theory

  • Consolidation theory

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Activation-Synthesis Theory

  • Dreams caused by random neural firing

  • Cerebral cortex tries to make sense of it

  • Biological theory

    • explained by biological processes (no real meaning)

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Information Processing/Consolidation Theory

  • Brain is processing information from the day

  • Information is moved to memory

  • This neural activity causes dreams

  • A cognition explanation

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How do we know sleep is important?

  • We sleep

  • Health problems associated with lack of sleep

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How do we know dreams are important?

  • We dream

  • REM Rebound

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Sleep Cycle Chart

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Beta Waves (Image matching)

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Theta Waves (Image matching)

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Alpha Waves (Image matching)

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Delta Waves (Image matching)

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Common Sleep Disorders

They interrupt sleep or are symptoms of dysregulated sleep

  • Insomnia

  • Narcolepsy

  • Sleep Apnea

  • Somnubulism

  • REM Sleep Behavior Disorder

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Insomnia

Inability to fall asleep

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Narcolepsy

Inability to stay awake

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Sleep Apnea

Condition where you stop breathing in your sleep and wake up

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Somnobulism

Sleepwalking

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REM Sleep Bahavior Disorder

Keep getting thrown back inot REM sleep - not getting other stages

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Sensation

  • Involves our senses

  • Collects information from the outside world

  • Use process of transduction

  • Senses work together

    • Synthesia

    • McGurk Effect

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McGurk Effect

Conflicting information presented to eyes & ears and brain can’t comprehend it so it overrides it with vision

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Synesthesia

  • Means joined sensations

  • neurological condition that causes sensory crossovers, such as tasting colors or seeing shapes when smelling certain scents

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Absolute Threshold

  • Detect stimuli 50% of the time

  • From nothing to something

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Just Noticable Difference/Difference Threshold

Notice a change in stimuli intensity

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Weber’s Law

Proportional change in stimuli is necessary

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Color Vision Theories

  • Trichromatic Theory

  • Opponent Process Theory

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Trichromatic Theory

  • Red, Green, and Blue cones

  • Explains range of colors

  • Helps us understand color blindness

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Opponent Process Theory

  • Receptors come in pairs

    • Blue/Yellow

    • Red/Green

    • Black/White

  • Helps explain afterimages

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Vision Deficiencies

  • Near/Far-Sightedness

  • Colorblindness

  • Prosopagnosia

  • Blindsight

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Near/Far-Sightedness

  • problem with accomodation

  • refractive eye conditions that affect how light focuses on the retina

  • near: hard to see objects that are far away; the image is formed in front of the retina, instead of on it.

  • far: hard to see objects that are close up; the image is focused behind the retina.

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Colorblindness

  • Issues with cones or ganglion cells

  • dichromatism/monochromatism

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dichromatism

partial color blindness that occurs when a person's color vision is based on only two primary colors.

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monochromatism

rare form of color blindness in which people can only see shades of gray and are unable to differentiate colors

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Prosopagnosia

face-blindness

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Blindsight

Sensing things you can’t or don’t visually see

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Acetylcholine

  • Voluntary movement and muscle contraction

  • Learning

  • Memory

  • Sleep

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Dopamine

  • Movement

  • Attention & alertness

  • Rewards (related to addictions)

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GABA (gamma-aminobutyric acid)

inhibits excitation and anxiety (calming)

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Endorphins

  • Pain, relief, and feelings of pleasure

  • Stress reduction

  • “natural opiates”

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Serotonin

  • Mood regulation

  • Hunger/appetite

  • Sleep

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Epinephrine/Norepinephrine

  • “Fight or Flight” response (increased heart rate, circulation, respiration)

  • Alertness/Arousal

  • Norepineprine slows down appetite and digestion during fight or flight

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Glutamate

  • Brain’s major excitatory neurotransmitter

  • creates links between neurons that form basis of learning, long-term memory