PSY-P 335 Study Guide - Quiz Guide: Occipital Lobe, Color Vision, Extrastriate Cortex
11 Oct 2017
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Confounding variables: systematically varies with iv ex) age/sex confounded with gender, health/race with ses, word freq. w/ word length: frequently used for correlational studies ex) poverty shortened lifespan, poor diet, crowded living condition. Used mostly in animals & occasionally brain surgery patients. Used to only record/stim 1 neuron in anesthetized animal, now can record 100+ cells in a awake/moving animal learned a lot about neural processing from this, particularly w/ area of early visual processing. Placing many different electrodes on scalp to record many neurons under the area(same technology as eeg: time locked to given stimulus presentation, safe & painless. Plotts voltage as time func(v on vert, t on hor) Must do many trials-1 is too noisy, signals are very variable so must average for many trials for 1 person. Active area of brain needs energy carried by blood to active areas & shows how active area is. Older technology but risks radioactive tracer exposure.
