A. interposition
B. convergence
C. closure
D. linear perspective
A. relationship between sounds and their meanings
B. relationship between different languages
C. origins of words
D. study of infant babbling
A. classical conditioning
B. operant conditioning
C. observational learning
D. insight learning
A. visual working memory
B. auditory working memory
C. visual short-term memory
D. visual sensory memory
A. somatic cells
B. ova and sperm cells
C. both a and b
D. none of these
A. serotonin
B. endorphins
C. dopamine
D. insulin
A. fixed-ration schedule
B. variable-interval schedule
C. fixed-interval schedule
D. verbal-interval-schedule