Test your understanding by watching the clip and by answering the drag and drop questions at different points in these short videos. This is a powerful and interactive way to help consolidate your learning. If you are viewing this on a mobile device the video will pause and a little purple hand will appear that you click on to see the exercise.
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The first clip is on the biology of stress, in particular the role of the hypothalamus, Pituitary gland and Adrenal gland, called the HPA Axis

This explains the seminal Little Albert study using the classical conditioning formula: