Presentation on theme: "The Limbic System (AKA inner brain) LOCATION: Deep within brain, next to thalamus, at top of brain stem FUNCTION? – The 4 Fs : fight, flight, food, fornication!"— Presentation transcript:
The Limbic System (AKA inner brain) LOCATION: Deep within brain, next to thalamus, at top of brain stem FUNCTION? – The 4 Fs : fight, flight, food, fornication! – memory!!
Hypothalamus: bodys regulator 1.In charge of endocrine system 2.Regulates – hunger & thirst if ventromedial hypothalamus is stimulated, rats STOP eating if lateral hypothalamus is stimulated, rats eat if lateral hypothalamus is lesioned, rats will not eat – response to pain – levels of pleasure – sexual satisfaction – anger and aggressive behavior 3.Regulates the autonomic nervous system pulse, blood pressure, breathing, and arousal in response to emotional circumstances.
Pituitary Gland --master gland of endocrine system 1.Regulates body temperature 2.Creates and releases: – Growth hormone – prolactin (tells womans breasts to produce milk after giving birth) – hormone to signal sperm production and releases of eggs 3.Creates hormones messages and directs bodys other glands to produce hormones for: – stress cortisol released by adrenal glands
Amygdala: Emotions, fear, memories Location: Within temporal lobe Function: 1.Directs aggressive and fearful responses – Lesion=less aggression, more mild, meek demeanor – stimulation=extreme aggression! 2.Plays role in formation of emotionally charged memories Interesting facts: 1.Size positively correlates with levels of aggression 2.Shrinks by 30% in castrated males!! video on flight or fight response
Hippocampus Converts short- term explicit memories to long- term Video clipVideo clip: John Forbes story 9:55 go to end of part 2)part 2
How do we know what we know about the brain? Technology that allows us to see brain at work – EEG –charts brains electrical brain waves E for electricity! Output is a graph of lines registering different brain wave patterns – PETshows where brain activity is occurring by showing where glucose is being consumed after person given radioactive glucose Mnemonic: Give your pet some sugar and watch how it responds! – MRIshows soft tissue areas of brain using magnetic pulses (good for finding tumors or enlarged/smaller than usual areas) m for magnetic – fMRImeasures second-by-second images of blood flow to show which part of brain is active during certain mental functions f for function – CAT (CT) --x-ray of brain, similar to MRI think of your cat having x-ray vision Research, clinical observation, and case studies (HM anterograde amnesia) Split-brain patients (Sperry, Gazzaniga) Lesions and stimulation experiments (rats, cats) start at 5 min. video clip brain surgery
A look at scans and how they are done PET scan 2.CAT scan 3.MRI 4.MRI or PET machine 5.fMRI 6.EEG 7.EEG output video clip MEGvideo clip MEG start at 4 min
Quick quiz Label your brain in the lecture packet