To infer the functional effects of these differences, they ran
multiple computational analyses, including comparisons to massive databases of known gene functions and of mice in which genes are artificially deactivated.
The strongest research methods for psychological studies are: qualitative findings versus quantitative; experimental rather than descriptive or correlational; controlled - experiment, meta -
analysis, and observation designs over archival, case study,
computational modeling, content
analysis, field experiment, interview, neuroimaging, quasi experiment, self - report inventory, random sample survey, or twin study; and prospective (where subjects are recruited prior to the proposed independent effects being administered) and longitudinal (where subjects are studied at
multiple time points) rather than retrospective or cross-section study.