PSYC W1001 Lecture Notes - Lecture 7: Functional Magnetic Resonance Imaging, Positron Emission Tomography, Transcranial Magnetic Stimulation
10 Feb 2016
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Document Summary
Structural brain imaging techniques: computerized axial tomography (cat) scan, magnetic resonance imaging (mri) Tells if there is damage or abnormal sizes. Chapter 4: sensation and perception: perception depends on sensory differences, meaning and history of it, expectations, etc, optical illusions. Same things that are taken in by senses, change when different people perceive it: context changes the way one perceives the information. Impose meaning & organization: constructed, psychophysics, perceptions differ between people, measure the strength of stimulus and observer"s sensitivity to stimulus. Using absolute threshold: signal detection theory. Stimulus intensities, threshold, and decision making can differ/change due to uncertainty depending on many factors: accuracy is to be able to identify between hit and misses, measuring thresholds, thresholds. Just noticeable difference (jnd): minimal change in stimulus that can just barely be detected: weber"s law: jnd of stimulus is constant proportion despite variations in intensity.
