● NATURE VS. NURTURE ANSWER IS BOTH o Twin Studies: ▪ Identical twins – Monozygotic (MZ) ▪ Fraternal twins – Dizygotic (DZ) o Genetics: MZ twins will have a higher percentage of also developing a disease o Environment: MZ twins raised indifferent environments show differences ● ENDOCRINE SYSTEMsends hormones throughout the body o Pituitary Gland Controlled by hypothalamus. release growth hormones o Adrenal Glands related to sympathetic NS: releases adrenaline ● BRAIN IMAGING: o EEG: brain activity – not specific o XRAY: not useful, doesn’t show tissues o CT / MRI shows structures o PET: glucose shows brain activity (when in doubt pick this one) o fMRI: glucose shows activity real time o lesion – brain damage Sensation & Perception – 8%) ● ABSOLUTE THRESHOLD detection of signal 50% of time (is it there DIFFERENCE THRESHOLD (also
