Corsi Block Span Task (Forward & Backward)

Introduction

The Corsi Block Span task is a classic psychological experiment used to measure visuospatial working memory. It involves remembering the sequence of blocks that are highlighted and reproducing that sequence either in the same order (Forward) or in reverse order (Backward).

The backward Corsi block-tapping task is a classic test of working memory. In this task, you need to remember the sequence of highlighted blocks and click them in reverse order. Compared to the forward Corsi test, the backward version is more challenging as it requires you to mentally reverse the sequence. Corsi span refers to the longest sequence length you can correctly reproduce in reverse order. The average score is about 6, with a maximum of 9.

How to Play

1. Choose your preferred mode (Forward or Backward) to start. 2. A sequence of blocks will light up one by one. Remember the order. 3. After the sequence ends, click the blocks in the required order (same for Forward, reverse for Backward). 4. The task gets progressively harder as you succeed.

1. The test starts with a sequence of 2 blocks. 2. Watch the blocks highlight in sequence. 3. After remembering the order, click the blocks in reverse order. 4. Correct answers increase the sequence length. 5. Wrong answers give you one retry chance. 6. Two consecutive errors at the same length end the test, and your score is your backward span. 7. Try to challenge for a higher backward span!

References

• Corsi, P. M. (1972). Human memory and the medial temporal region of the brain (Doctoral dissertation, McGill University).
• Kessels, R. P. C., van Zandvoort, M. J. E., Postma, A., Kappelle, L. J., & de Haan, E. H. F. (2000). The Corsi Block-Tapping Task: Standardization and normative data. Applied Neuropsychology, 7(4), 252-258.
• Berch, D. B., Krikorian, R., & Huha, E. M. (1998). The Corsi Block-Tapping Task: Methodological and theoretical considerations. Brain and Cognition, 38(3), 317-338.