A child psychologist treated four children who were afraid of snakes with a behavioral modification procedure called

Question:

A child psychologist treated four children who were afraid of snakes with a behavioral modification procedure called systematic desensitization. In this procedure, children were slowly introduced to a snake over four treatment sessions. Children rated how fearful they were of the snake before the first session (baseline) and following each treatment session. Higher ratings indicated greater fear. The hypothetical data are listed in the table.