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PSYCH 3JJ3 (18)

3JJ3- sept 19.docx

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Louis A Schmidt

3JJ3 – September 19, 2013 - Two competing views – biological (predispositions, regulation of emotions) vs. Environment (attachment related) - This lecture – some slides posted Neurological Foundations Hemispheric lateralization – illustrative empirical examples from the laboratory - Historical precedent o Scientists and clinicians have long presumed the two cerebral hemispheres had different functions in the affective domain (1879 – John Hughlings Jackson) o Evidence from a variety of sources (brain injury, sodium amytal studies, brain imaging) suggested hemispheres differentially involved in emotion o Ex. Phineas Gage, he survived after the accident but his personality drastically changed - Theoretical platform – frontal asymmetry of emotion o Emotions are organized around approach-withdrawal motivational techniques o Left frontal cortex involved in approach-related emotions (ex. joy, happy, interest) o Right frontal cortex involved in withdrawal related emotions (fear, anger, disgust) o Pattern of restring frontal EEG activity may reflect basic approach-avoidance tendencies o Left frontal EEG asymmetry is approach o Right frontal EEG asymmetry is withdrawal o Pattern of asymmetry may reflect individual differences in affective style o Those who have more left activity tend to be more extroverted, happy, etc. o Those who have more activity on the right are more withdrawn o Over 100 empirical studies in support of this idea (see Coan & Allen, 2004 for a review) - EEG caps illustrating standard 10-20 system and dense array o Measure activity of the scalp o Dense array – used on adults - Measure o Alpha activity has been linked to a cortical idling rhythm – activity is 8-13Hz o 1920s- researcher used his son with EEG – gave his son problems (ie math)  Found that under times of stress (challenging problems) – there was more activity under this frequency band  This band is now known as the stress related band o Decrease in synchronous activity in the alpha band and adults is associated with activation o When populations of cortical neurons become activated, there is a decrease in amplitude o Alpha power is extracted from background EEG by subjecting the signal to Fourier analysis, which decompose
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