Cross-sectional research is research that measures the behavior of one or more study participants at more than one point in time

Glutamate is an excitatory neurotransmitter that researchers suspect might be involved in schizophrenia because

a. it makes dopamine. b. it causes the ventricles to enlarge. c. it is missing in the brains of people with schizophrenia. d. alterations in glutamate levels can produce schizophrenic-like symptoms in normal subjects.

What does introspection mean?

a. Looking within yourself b. Analyzing data c. Presenting carefully measured stimuli d. Working together as a group