PSY 111 Lecture Notes - Lecture 6: Internal Validity, External Validity, Dependent And Independent Variables
Document Summary
Experimental researcher manipulates one or more independent variables, measures effect on dependent variables. Experimental researcher is able to keep extraneous factors constant. Internal validity the degree to which an experiment supports clear causal conclusions (if experiment is well-designed and properly conducted) Confounding of variables two variables are intertwined in such a way that we cannot determine which one has influenced a dependent variable (music does not affect ability to do a test, but mood resulting from music does) Demand characteristics cues that participants pick up about the hypothesis of a study or about how they are supposed to behave. Basic building blocks of the nervous system. 100 billion at birth, lose 10,000 every day. Glial cells surround neurons and hold them in place: also manufacture nutrients, form myelin sheath, absorb toxins and waste, guide newly divided neurons to place in brain during development. Blood-brain barrier prevents substances from entering brain.
