AP Psych Unit 7 Part 1

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59 Terms

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Sensory Afferent Neurons
Neurons that send incoming sensory information detected by receptors to the brain/spinal cord for processing

(feeling squeeze on shoulder)
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Interneurons
Neurons within the brain and spinal cord that enable communication between sensory/motor neurons
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Motor Efferent Neurons
Neurons that activate effectors such as muscles to enable motor movements

(Lifting up arm)
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Dendrites
Receives information from other neurons at receptor sites
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Receptor Sites
Surface of dendrites that activate due to neurotransmitters
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Axon
Sends messages received by the dendrites to the terminal for communication with other neurons
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Myelin Sheath
Fatty casing around the axon that quickens the velocity/speed of communication along the neuron
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Axon Terminals/Terminal Buttons
Branches at the end of the axon that contain neurotransmitters in the synaptic vesicles
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Synaptic Vesicles
Sacs in the terminal that store neurotransmitters until messages from the axon trigger release
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Resting Potential/Polarization
When a neuron is not transmitting or receiving a message because the interior of the neuron is more negative than the outside

(Neurons are Normally Negative)
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Action Potential/Neuron Impulse
Brief electrical charge that occurs when a neuron is stimulated (fires) by another neuron
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Threshold of Extinction
Amount of stimulation needed for a neuron to fire (go from “resting potential” to “action potential”)
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All-or-None Response
Once threshold is reached - the neuron fully fires - same magnitude of intensity every time
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Refractory Period/Hyperpolarization
Short time period after a neuron fires - when a neuron returns to resting potential and cannot fire again

RE-factory period

RE-set period/Resting
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Action Potential Graph

1. Stimulus intensity reaches threshold while neuron is polarized (resting)
2. Depolarization - sodium (+) enters the neuron (becomes positive)
3. Repolarization- potassium (+) exits the neuron (REturning to negative)
4. Hyperpolarization - refractory period
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Synapse
Location of neural communication between two neurons


1. Terminal of the presynaptic neuron
2. Synaptic cleft/gap (literal space)
3. Receptor sites on dendrites of the postsynaptic neuron
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Neurotransmitters
Chemicals held in the synaptic vesicles of the axon terminal

During action potential they are released from those vesicles into the synaptic cleft causing the stimulation of other neurons
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Reuptake
Absorption of neurotransmitters in the synapse back to the sending neuron after stimulating the receiving neuron
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Long-term Potential
The process of neural communication strengthening (faster) after repeated patterns

* The literal reason you study (improves remembering)
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Excitatory
Type of neurotransmitter

Causes more action potential
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Inhibitory
Type of neurotransmitter

Stops action potential
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Serotonin
Mood regulation

Linked with depression
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Acetylcholine
Enables muscle movements and linked with memory

Difficulty with movement and memory (Alzheimer’s)
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Dopamine
Brains pleasure reward system

High levels linked to schizophrenia

Low levels linked to parkisons disease
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Norepinephrine
Regulation of alertness and arousal
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Endorphins
Body’s natural pain killer/stress maintenance

“Runners high” - Euphoric experience after workout
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Glutamate
Most common excitatory neurotransmitter - active for most normal cognitive functioning (thinking)
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GABA
Most common inhibitory neurotransmitter - reduces brain activity

Low levels linked with insomnia
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Depressants
Slows the activity of neurons and body functions (alcohol, morphine)
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Stimulants
Stimulate activity of neurons (caffeine, nicotine, cocaine)
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Hallucinogens
Vivid and distorted visual/auditory perception not based on sensory input (ecstasy, LSD)
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Withdrawal
Physical discomfort when the substance is stopped
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Tolerance
Declining psychological effects of a drug after substained use
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Dependence
Relying on a drug to avoid withdrawal
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Addiction
Uncontrollable cravings to use a drug or do a behavior
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Central Nervous System
Brain and spinal cord
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Pons + Reticular Formation
Regulation of arousal, alertness, wakeness, dreaming

Damage could cause a coma

Location: Brain stem
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Medulla
Controls vital automatic functions (heartbeat, swallowing, breathing)

Location: Brain stem
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Cerebellum
Coordinates smooth voluntary movement and balance
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Thalamus
Relays sensory signals (except smell) to the corresponding cortex
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Limbic System
Network of brain structures responsible for memory, emotion, and motivation

Contains: Hippocampus, Amygdala, Hypothalamus
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Amygdala
Emotions such as through facial expressions and “fight or flight” response (fear + aggression)
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Hypothalamus
“Maintenence activites” since it links to nervous system to endocrine systems (horomones)

(Hunger, thirst, sex drive, body temp)
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Hippocampus
Formation of long-term memory
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Corpus Callosum
Collection of neuron axons that connect both hemispheres

Severed to stop epileptic seizures
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Association Areas
Areas not associated with receiving sensory information/muscle movements
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Temporal Lobes
Auditory sensory processing and memory

Contains: Wernicke’s Area, Hippocampus
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Wernicke’s Area
Understanding written/spoken speech

When damaged: Cannot understand language
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Occipital Lobes
Visual sensory processing

Contains: Visual cortex
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Parietal Lobes
Processes sense of touch at the somatosensory cortex aka “sensory cortex”

Larger regions for areas with higher sensitivity
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Frontal Lobes
Enables movement, high level cognition and language production


1. Motor cortex
2. Prefrontal cortex (make + carry out plans/judgement/reasoning)
3. Broca’s Area
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Broca’s Area
Muscle movements controlling speech

When damaged: Broca’s Aphasia (cannot perform muscle movements necessary to speak
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Spinal Cord
Series of inter neurons that connect the brain to the rest of the body


1. Carries motor movement messages from the brain
2. Carries messages from sensory neurons (ex. touch) to the brain
3. Enables spinal reflexes - without the brain - due to inter neurons in the spinal cord
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Peripheral Nervous System
Sensory/motor neurons outside of the brain
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Automatic Nervous System
Responsible for enabling bodily activities via effectors (ex. stomach) that are not knowingly controlled

(Heartbeat, digestion)
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Polygraph Test (Lie Detector)
Measures autonomic arousal, however, “guilt” measures the same as many emotions

Very unreliable
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Sympathetic Nervous System
Active when you are aroused by expending energy (ex. fear response)

When activated: Dialates pupils, heartbeat goes up, digestion goes down, relaxes bladder, high adrenaline
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Parasympathetic Nervous System
Active when you are relaxing and saving energy

When activated: Constricts pupils, heartbeat goes down, digestion goes up, contracts bladder, salvation goes up
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Somatic Nervous System
Enables movement of effectors (muscles) you can control via motor neurons (thus producing voluntary movement)