PSYCH 3M03 Lecture Notes - Lecture 18: Perspiration, Fear Conditioning, Olfactory Bulb
25 Jan 2018
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Document Summary
Chapter 6 pain, fear, and comfort: motivation to seek comfort in reaction to excess heat or cold. Autonomic and endocrine responses: temperature sensed by cutaneous receptors, information integrated with hypothalamic temperature-sensitive neurons. Heat conservation posterior nucleus of hypothalamus anterior pituitary: increased thyroid hormone secretion, increased sympathetic nervous system activation, shivering, piloerection, vasoconstriction. Heat dissipation preoptic nucleus of hypothalamus anterior pituitary: decreased thyroid hormone secretion, decreased sympathetic nervous system activation, sweating, panting, thirst, vasodilation. Behavioural responses: behavioural drive to escape and avoid environments that are too hot or too cold. Adaptive value of pain: disincentive for maladaptive and self-injurious behaviours, punishes activity when rest and recovery are needed. Variability in pain perception: pain perception is highly subjective, pain perception is often not proportional to injury. C unmyelinated slow, dull, aching pain. A myelinated sharp, fast, pricking pain. Enkephalins: small peptides from diverse sources, concentrated in periaqueductal gray (pag) and dorsal horn of spinal cord.
