PSY 110 Lecture Notes - Lecture 2: Blind Experiment, Selection Bias, Quasi
20 Feb 2017
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Since it"s non experimental, cannot determine cause and effect relationships. Coefficient indicates strength and direction of relationship between two variables. Good for topics that can"t be manipulated. Compares treatment group to control: violence based on watching tv shows. Placebo effect: what participant expects, announces the expected result. Experimenter bias: clever hans, deliberately influence results. Random assignment and double blind technique: used for testing if drugs treat anxiety, behavior expectations make it work. Single blind procedure: experimenter or participant knows treatment. Double blind: experimenter nor participant knows treatment. Random assignment is used to avoid selection bias. Quasi experiments: when random assignments isn"t possible. Participant related bias: subjects are not representative of population. Be aware of subjects race, gender, age, ses, and educational level. Neurons have 3 parts: cell body or soma, dendrites, axon. Information is usually carried out of the axon. Electrical impulses charge impermeability: resting -70 millivolts, action potential +50 millivolts. Myelin sheath: fatty coating on axon.
