Dr. Shane debunked facilitated communication by running a double-blind study. How did Dr. Shane do this? Choose two that apply.

He showed pictures to them both and asked what they saw. Sometimes he showed the same picture sometimes he showed different pictures.

Dr. Shane used a changing criterion single case research design to test his hypothesis.

Shane took Betsy to a corridor without her facilitator and told her to look at a picture. When taken back to the original room, Betsy was asked to type what she saw and she was unable to do so. With the facilitator present, she was able to type what she saw..

He whispered the correct response into the participants ear and a different word into the facilitators ear.