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Scientific Method

Scientific Method. Experimental Research. An experiment is a scientific investigation that sets out to determine the cause and effect of two or more variables. A “good” experiment… 1. manipulates the independent variable 2. compares the groups in terms of the dependent variable

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Scientific Method

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  1. Scientific Method

  2. Experimental Research An experiment is a scientific investigation that sets out to determine the cause and effect of two or more variables. A “good” experiment… 1. manipulates the independent variable 2. compares the groups in terms of the dependent variable 3. assures that only the IV causes the changes in the DV if this is accomplished then the experiment has internal validity 4. minimizes confounding variables any variable that varies along with the IV 5. uses various types of randomization 6. maintains experimenter control

  3. Independent or Dependent? • Independent Variable • What the experimenter manipulates • The “cause” of the experiment • It is “independent” of all other variables • Dependent Variable • What the experimenter measures • The “effect” of the experiment • It “depends” on the Independent Variable

  4. Operational Definition • A definition of a variable that allows it to be concretely measured. • A variable is anAbstract Concept • It must be translated into aConcrete Form • so it can be measured • and studied empirically • Helps to successfully communicate ideas to others • Often a variety of measures are used

  5. Scientific Method

  6. Physiological Psychology • Levels of • Investigation • Social • Individual • System • Cellular • Molecular

  7. Neurological Disorders

  8. Psychological Disorders 10 million people suffer from depression

  9. Scientific Approaches of Physiological Psychology • Somatic Intervention • alter body (soma) and then record behavior changes • Behavioral Intervention • alter behavior and then record body (brain) changes • Correlation • determine the relationship between body measures • and behavioral measures

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