PSYCH 130 Chapter Notes - Chapter 2.2: Functional Magnetic Resonance Imaging, Positron Emission Tomography, Near-Infrared Spectroscopy
25 Nov 2017
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Measure the relationship between nervous system processes and behavior. Used to find out which structures contribute to development and individual differences. Involuntary activities of the autonomic nervous system are highly sensitive to psychological state. Heart rate slows during concentration and rises during distress. Saliva concentrations of cortisol provide info about stress reactivity. Cortisol increases respiration rate, blood pressure and blood sugar, suppresses immune system, heightens memories for emotionally charged events. Chronically abnormal cortisol levels signal disrupted stress response system. Electroencephalogram (eeg): examine brain wave patterns for stability and organization (signs of mature functioning in the cortex) Process particular stimulus event related potentials (erps) detect general location of brain wave activity. Erps: frequency and amplitude of brain waves are recorded in multiple areas allows identification of regions of stimulus induced activity. Electrodes record activity in brain"s outer layer (cerebral cortex) Neuroimaging techniques: provide detailed 3d computerized pictures of the entire brain and active areas.
