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)