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Simple and choice reaction time

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Why choosing between two keys takes longer than pressing the same key every time.

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What to do and say

A sample script of about 60 words. Say it your own way. Fill in the highlighted parts from your own run of the test, such as the numbers on your results screen.

  1. 0:00

    DoTake the one-key demo on the conductcognition.com home page: press Space or tap when the circle appears.

    SayPress as fast as you can when the circle appears. One key, every time.

  2. 0:10

    DoNow run the Choice Reaction Time test: the circle appears on the left or the right, and you press that arrow key.

    SayNow the circle shows up on the left or the right, and I press the arrow on that side.

  3. 0:20

    DoShow both times and say why choosing is slower.

    SayOne key took me [median response time]. Choosing took [Average reaction time]. Choosing is slower, and every extra choice adds time. Try it at conductcognition.com.

Posting it yourself? Say that ConductScience paid you, in the video or the caption, and use the platform's paid partnership label if it has one.

All 12 scripts on one page, to print

What viewers should learn

People respond more slowly when they must choose between responses, and the delay grows with the number of choices.

Classic paper: Hick, 1952.

Try the test before you film

Take it yourself first: Choice Reaction Time on conductcognition.com. On the test's page, choose Preview it free. It asks you to sign in, or to create a free account.

Film yourself taking the test, or use sample data. Never show real participants, children, patients, private records or unpublished results. Get permission before you film at your school or workplace, or name it. The handbook has the rest.

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