Gordon is conducting a memory study that consists of two treatment conditions. All goes well on the first day when he is working with the first treatment condition. However, on the second day, violent thunderstorms descend when he is working with the second treatment condition. What is the source of the threat to internal validity?

Environment

Explanation:

In a research study, internal validity refers to how well an experiment was carried out and to what extent the piece of evidence supports a claim.

The lesser the chance of confounding in a study the higher the internal validity.

Study of memory is possible through learning the electrical activity created by neurons.

Therefore, thunderstorm will affect the readings hence it is an Environmental threat to the internal validity.

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