PSYC 344 Lecture Notes - Lecture 13: Sensory Nerve, Nociceptor, Withdrawal Reflex
14 Oct 2021
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Feel better over time as it heals. Recurrent intermittent pain over time for 3+ months. Chronic continuous/ intermittent pain that lasts at least 6+ months. Physical characteristics of stimuli- what kind of pain is it (exl burn) Prompts withdrawal reflex to end pain (ex: pulling your hand off a hot stove if you burn it) Activates defense behaviors- getting away from paint and coping with pain. Thoughts about pain- meaning/consequences of pain (ex: sore from working out=good pain) Fast pain system: message passed from thalamus to somatosensory cortex. Slow pain system: message travels from brainstem amygdala somatosensory cortex: pain fibers connect with sensory nerves that control touch, pressure, and limb movement to thalamus, fast pain pathway triggers neural activity in reticular formation. Substance p + glutamate stimulate nerve endings at site of injury and spinal chord to make you feel pain. Serotonin enkephalins (endorphins) bind to receptors in brain to reduce pain sensations.
