What are the types of contextual interference?

• A. Random
• B. Blocked, Serial, Random
• C. Serial, Random, Blocked
• D. Blocked, Random, Serial

Answer: (B)

The idea being tested is how different practice schedules create contextual interference, which affects learning and transfer. The three standard practice formats are blocked, serial, and random.

Blocked practice repeats the same task many times before switching to another, so the environment feels predictable during practice but doesn’t force you to continually retrieve and reconfigure skills. Serial practice mixes tasks in a fixed order, introducing more interference than blocked because you have to remember the sequence and adapt to different tasks in a set pattern. Random practice presents tasks in a random order, maximizing interference during practice and requiring ongoing retrieval and adaptation, which often leads to better long-term learning and transfer.

So the complete set of contextual interference types is Blocked, Serial, and Random, which is why that option is the best choice. The other options don’t list all three.