psyc2 - Research Methods "Can mental events influence...

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Research Methods Can mental events influence physical health ?” Pennebaker study (1990) asked college students to write for 20 min on 3 consecutive days: » Emotional expression: “…your deepest thoughts” » Control group: “what have you done since waking this morning?”
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Research Methods Pennebaker measured visits to campus health center for subjects in both groups » Emotional expression subjects made fewer visits to the health center Can mental events influence physical health ?” Yes, emotional expression can improve health. ..
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Research Concepts Psychologists are interested in determining the causes of mental events and behaviors What is the impact (effect) of divorce on children? Psychologists are interested in identifying psychological processes
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Issues in Theory: Systematic way of organizing observations Hypotheses - proposed relations between variables (cause-effect relationships) Variable: Any phenomenon that can vary along some dimension Continuous : varies continuously (body weight) Categorical : can take on fixed values (gender)
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Generalizability of Research take samples from limited portion of the entire population (sampling must be representative). Generalizability - can results be applied to entire population of interest? requires: Internal validity : Are the procedures of the study sound or are they flawed? External validity : Does the experimental situation resemble the situation found in the real world?
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Measure : concrete means to determine the value of a variable How do you measure “illness”? “illness” - number of times that a subject visits a clinic How do you measure “hunger”? “hunger” - how long a subject has
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psyc2 - Research Methods "Can mental events influence...

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