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Lecture 4

PSY100H lecture 4 - gambling study

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Dan Dolderman

Alexandra Zylka st February 1 , 2011 PSY100- Lecture 4 Gambling study and PFC - Non conscious biases, in the form of visceral signals, “gut feelings,” can serve as guides to wise/intelligent behaviour - Our non-conscious implicit system can achieve insight BEFORE conscious awareness. - These visceral feelings, our biases, are crucial for motivation; without emotional KICK, knowledge alone does not motivate behaviour change. The Split Brain - The two hemispheres of the brain are actually two mini-brains connected by a bundle of fibers, the corpus collosum - In the 1930s – 1950s, cutting the corpus collosum became all the rage, to help people with epileptic seizures and other disorders - Amazingly, these people seemed pretty normal, but clever psychologists (like Gazzaniga, your textbook author) discovered ways of communicating separately with the now-independent hemispheres. Split- Brain experiments - When asked to point to the item that was seen, the left hand (RG) pointed to the image seen by the right hemisphere. (figure 4.7 in textbook) Similarly to blind sight, in which some brain areas know things that other brain areas do not, a patient can have emotional reactions to stimuli that the left brain doesn’t know it’s seen other experiment where left brain makes up incorrect rationalization for actions, person believes it….(slide) Left hemisphere is speech. Neural Plasticity - The brain changes continuously - “Our brains; connections are refined and returned with every experience of our lives” - Only recently have we begun to appreciate our brains’ incredible “plasticity” – or ability to change. - Plasticity is amazing, but the limits are unknown. - Certainly, age is a factor: ex. Very young children with severe epilepsy > radical hemispherectomy – mostly normal functioning! - Brain areas can even recruit systems normally devoted to other tasks. o Ex. Cut off a finger > that part of the sensory cortex will start to receive signals from the other fingers > enhanced sensitivity o Ex. If blind > the sensory cortex corresponding to the Braille-reading finger expands ; sense of touch starts to get processed by the visual cortex - In essence, this is how our sensorimotor cortices evolved in the first place. The Mind is what the Brain does? - The fact that our experience of the word relies intimately on the brain is shown in the bizarre perceptual experiences of patients with certain kinds of neurological damage or dysfunction o Ex, Oliver Sacks. Neurological-perceptual Problems - Blind sight – specific part of visual cortex is damaged o Ex, guessing shapes, or spatial locations of shapes on a screen, or movement directions of dots on a screen. o Ex. 53 year old physician with no functional visual cortices > recognizing face expressions o Ex. Anton-Babinski syndrome: full cortical blindness but conscious denial of it insistence that one can see normally! Sensations - Sensation refers to how sense organs respond to and detect external stimulus energy, and how those responses are t
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