Psychological refractory period.

The idea

The psychological refractory period (PRP) is the delay in responding to a second stimulus when it arrives shortly after a first stimulus that is still being processed. In AQA A-Level Physical Education, this belongs to the study of how efficiently performers process information. A practical example is a badminton player who has committed to a drop shot: while the brain is still selecting and programming that response, the opponent plays a fast drive, and the reply to the second stimulus is slower than normal. The delay occurs because the performer is held to be a single-channel processor, so the second decision must wait until the first has been dealt with. The PRP is therefore a measurable cost of limited processing capacity, and it explains why disguising a first action or presenting a late second stimulus can deceive an opponent.

What earns the marks

• Defines the psychological refractory period as a delay in responding to a second stimulus presented shortly after a first stimulus.
• Explains that the delay arises because the first stimulus is still being processed when the second arrives.
• Links the effect to limited processing capacity or a single-channel processor.
• Applies the concept to a sporting example, such as a performer reacting more slowly to a late second stimulus.
• Recognises that the PRP can be used tactically to deceive an opponent, for example by disguising the first action.

Common mistakes and how to put them right

• Thinking the PRP means the second stimulus is not detected at all.

  Put it right: The second stimulus is detected, but the response to it is delayed while the first is processed.

• Confusing the PRP with a simple reaction-time measure.

  Put it right: The PRP specifically concerns the delay caused by a preceding, still-unprocessed stimulus.

• Assuming the PRP is a permanent trait of a performer.

  Put it right: It is a temporary processing delay that depends on the timing and demands of the stimuli.

• Believing that practice removes the PRP completely.

  Put it right: Practice can improve processing efficiency, but the underlying single-channel limitation remains.

Exam tips

• Define the term precisely before applying it, so the examiner can see the concept is understood.
• Use a named sporting example and state clearly which stimulus is first and which is second.
• Explain the mechanism, not just the outcome: say that the first stimulus is still being processed when the second arrives.
• If asked to suggest a tactic, link the PRP to deception, such as disguising the first action to delay the opponent's response.