A hallmark of experimental studies is
a. the manipulation of time in the presentation of the materials to the subject.
b. the manipulation of only one variable as often as possible to determine the effects of thatvariable.
c. the manipulation of every variable at each stage of the experiment.
d. the manipulation of one or more factors and observation of how these manipulations change the behavior under investigation.
Question 2
Bidirectionality of structure and function refers to
a. an organism's being capable of using either hand or foot.
b. genetic determinism.
c. the interaction of the functional invariants of assimilation and accommodation with cognitiveschemas.
d. structure (e.g., biological substrate) affecting function (e.g., activity) and function affecting structure.
Meta-analysis of 18 studies shows that aerobic exercise causes better performance in older adults on
Experimental demonstration of respiratory control
Cross-Sectional Studies
Time spent on, paid work and housework, by living arrangements of Canadian
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