Which of the following researchers suggests a traditional stance to child rearing which encourages toilet training to be done early and quickly?

If a placebo is used, researchers assume that differences in group performance are not due to:

a. experimenter expectancies about the experiment b. differences in the personal characteristics of subjects in each group c. subject expectancies about the experiment d. the environmental conditions that are intentionally manipulated in the experiment

___________ is the sudden perception of relationships among elements in the perceptual field

Fill in the blank(s) with correct word