Researchers studying the effects of caffeine tested the reaction times of women who first drank either a beverage with caffeine or a decaffeinated version of the same beverage. In this study, the reaction time of each participant would be:
a. a placebo
b. a confounding variable
c. the independent variable
d. the dependent variable
D
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Which of the following is a device that provides a detailed, three-dimensional computer-generated image of brain activity by aiming a powerful magnetic field at the brain?
A. electroencephalogram (EEG) B. mobile operational pulsar (MOP) C. computerized axial tomography (CAT) scan D. functional magnetic resonance imaging (fMRI) scan
On her first birthday, Emily looks at her mother as they observe the clown coming to her party. At first Emily is crying. Then her mother smiles and acts very happy, so Emily smiles, too. This is an example of
a. empathy. b. attachment. c. visual acuity. d. social referencing.
A person with Broca's aphasia ____
a. has lost total knowledge of grammar b. has lost total knowledge of use of verbs c. recognizes that something is wrong with grammatically incorrect sentences d. insists that his or her utterances are grammatically correct and that other people are wrong
Head Start programs seem to enhance IQ scores of the children involved by exposing them to such materials as
a. letters and words. c. books. b. numbers. d. all of these.