PSY BEH 11B Lecture 5: Lecture 5 (Brain Structures and Memory, Inference from HM)

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Psychology and Social Behavior
Course Code
Kier Groulx

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PsyBeh 11B – Lecture 5 Overview & Key Brain Structures Memory Processes and Problems • Acquisition – failure to attend • Storage – transience • Retrieval – blocking Serial Position Task Results • Primacy Effect – more likely to recall items at the beginning • Recency Effect – at the end of list • Looking at serial position effects in free recall, the items reflected in the primacy effect are stored primarily in long-term memory, while those reflected in the recency effect are stored primarily in working memory o Because as you go down the list, you spend all attention on the earliest ones, attention divided by the time you get to the end • Increasing the presentation rate (less time per item) should have what effect? o Decrease primacy effect ▪ Less attention paid to each word Brain • Superior or Dorsal – towards the top • Inferior or Ventral – towards the bottom; your chin • Anterior – eyes; the front • Posterior – the back • Medial – toward the middle • Lateral – toward the side • Frontal – executive control, some aspects of memory, language production, motor control, etc. • Parietal – focuses on directing attention, how you know numbers, etc. • Occipital – low-level aspects of vision • Temporal – heavily involved with language recognition and language production, face recognition • Medial Temporal Lobe – very important part in memory • Brain stem and cerebellum - regulates involuntary things; balance Question • A friend has just had a stroke. You observe that, although he can hold a conversation and can recall events you shared in the past, when you leave and return the next day, he does not remember your previous visit. Most likely the damage from the stroke was primarily in which area of the brain? o Temporal lobe ▪ His executive control is still there; can still hold conversation so not frontal lobe Uncovering the Role of Hippocampus: HM • Age of seven, HM fell off bike and suffered from head injuries • Age 10, seizures • Isolated and removed where his seizures originated from o Unfortunately, it was a problem o He lost a chunk of his memory ▪ Couldn’t remember things o Intense amnesia • Was actually the Hippocampus that was damaged o It serves distinct role in memory o Damage to it leads to really really bad things Hypotheses about Memory Based HM • Summary of Hm’s memory status o Long-term memory storage and retrieval were unharmed ▪ Could still remember from before the accident o Working memory was unaffected ▪ Still able to process things happening a
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