Presentation on theme: "Physiology and behavior: Localization of function"— Presentation transcript:
1Physiology and behavior: Localization of function The BrainPhysiology and behavior: Localization of functionExplain one study related to localization of function in the brain.
2Explain one study related to localization of function in the brain. StudiesTermsScoville and MilnerMaguire et al.PhrenologyTanBroca’s AreaBroca’s AphasiaHMWernicke’s AphasiaHippocamous
3Early investigation of localization of function PhrenologyThe attempt to make inferences about ones personality and intelligence by examining skull formation.Done by manually searching for bumps and indentations.Franz Joseph Gall
4In general….If there is a bump or protrusion in that area it indicates MORE of that ability or trait.If there is an indentation it indicates a deficiency of that ability or trait.
5Phrenology? Do you think it is a valid science? Work was picked up by Cesare LombrosoThese ideas, although dangerous, are still the basis behind modern day criminal profiling.
6Case studies of people with naturally occurring brain damage Phineas GagePaul BrocaWorked with a patient he called “Tan”“Tan” could only say the word “Tan”“Tan” died
7Broca’s AreaIn post-mortem autopsy, Broca found damage in the left frontal area of Tan’s brain.Broca discovered the area of our brain that is responsible for making our mouth move during speech.
8Broca’s Aphasia Aphasia means damage to a speech area of our brain. Very common in TBI or stroke patients.
10Studies of individuals who have undergone brain surgery
11Damage to the hippocampus and memory (The HM Study) Scoville and Milner (1957) HM fell off his bicycle when he was 7, injuring his head.He began having epileptic seizures when he was 10.By the time he was 27 he had so many seizures he could not live a normal life.
12The HM Study Scoville and Milner (1957) Scoville performed experimental surgery on HM to stop the seizures.Seizures did stop, but HM had amnesia for the rest of his life.We learned a whole lot from HM’s issues.
13HM They removed parts of his temporal lobe. They took out a little too much and removed part of his hippocampus.Experienced both Retrograde and Anterograde Amnesia.
14Memories and the Hippocampus Retrograde AmnesiaAnterograde AmnesiaForget past.It can be time period, event or select person.Cannot form new memories.
15HM’s MemoryHe could not transfer new episodic or semantic memories (explicit memories) into his LTM.He COULD form new long-term procedural memories (implicit memories).He could carry on a normal conversation (working memory) but would forget it almost immediately.
16OK…what actually happened to HM’s brain? Corkin (1997) gave an old HM an MRIHe found missing parts of the temporal lobes and hippocampus and surrounding areas.These areas tend to be pathways for memory (highways for ACH).
17What can be learned about the relationship between brain and memory with HM? Our memory system is specialized and complex.The hippocampus plays a critical role in converting memories of experience from STM to LTM.HM retained some memories, so hippocampus does not store the memories, but processes them.
18Maguire et al. (2000)Aim: To investigate whether or not the hippocampus plays a role in human spatial memory
20Maguire et al. (2000) Method: London taxi drivers with a range of age and experience were the participants because their work requires the extensive use of spatial navigational skillsMatched pairs design: participants were age and gender matched with a control groupTwo different types of MRI scanning were used to assess how the brains of the taxi drivers differed from the control groupQuasi experiment
21Maguire et al. (2000)showed significantly more grey matter in both left and right hippocampi of the taxi drivers compared to the control group
22Maguire et al. (2000) Evaluation: No ethical implications Only observed malesOnly observed 16 matched pairsNature vs. Nurture debate: did the driving influence the change in the hippocampus, or did their larger than average hippocampus lead them to become taxi drivers?