Presentation on theme: "The Limbic System (AKA “inner brain”)"— Presentation transcript:
1 The Limbic System (AKA “inner brain”) LOCATION: Deep within brain, next to thalamus, at top of brain stemFUNCTION?The 4 F’s : fight, flight, food, fornication!memory!!
2 Hypothalamus: “body’s regulator” In charge of endocrine systemRegulateshunger & thirstif ventromedial hypothalamus is stimulated, rats STOP eatingif lateral hypothalamus is stimulated, rats eatif lateral hypothalamus is lesioned, rats will not eatresponse to painlevels of pleasuresexual satisfactionanger and aggressive behaviorRegulates the autonomic nervous system pulse, blood pressure, breathing, and arousal in response to emotional circumstances.
3 Pituitary Gland --master gland of endocrine system Regulates body temperatureCreates and releases:Growth hormoneprolactin (tells woman’s breasts to produce milk after giving birth)hormone to signal sperm production and releases of eggsCreates hormones messages and directs body’s other glands to produce hormones for:stresscortisol released by adrenal glands
4 Amygdala: Emotions, fear, memories Location: Within temporal lobeFunction:Directs aggressive and fearful responsesLesion=less aggression, more mild, meek demeanorstimulation=extreme aggression!Plays role in formation of emotionally charged memoriesInteresting facts:Size positively correlates with levels of aggressionShrinks by 30% in castrated males!!video on flight or fight response
5 Hippocampus Converts short-term explicit memories to long-term Video clip: John Forbes story 9:55 go to end of part 2)
6 How do we know what we know about the brain? start at 5 min. video clip brain surgeryTechnology that allows us to see brain at workEEG –charts brain’s electrical brain waves E for electricity! Output is a graph of lines registering different brain wave patternsPET—shows 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!MRI—shows soft tissue areas of brain using magnetic pulses (good for finding tumors or enlarged/smaller than usual areas) m for magneticfMRI—measures second-by-second images of blood flow to show which part of brain is active during certain mental functions f for functionCAT (CT) --x-ray of brain, similar to MRI think of your cat having x-ray visionResearch, clinical observation, and case studies (HM anterograde amnesia)Split-brain patients (Sperry, Gazzaniga)Lesions and stimulation experiments (rats, cats)
7 A look at scans and how they are done 3.2.PET scanCAT scanMRIMRI or PET machinefMRIEEGEEG output220.127.116.11.7.video clip MEG start at 4 min
8 Quick quizLabel your brain in the lecture packet
9 Answer Key: How’d you do at labeling your brain?