# 📝Hick’s law

tags
§ Design Psychology
source
Закон Хика, который мы потеряли в интерпретации - Vadym Shliachkov - Medium

The law says that the mean reaction time is linear function of the mean entropy. Entropy growths logarithmically with the number of choices available.

$RT = a + b * log_2 (n + 1)$

where

• $RT$ is reaction time
• $log_2 (n + 1)$ is mean entropy
• $a$ and $b$ are coefficients (should be found empirically for each case)
• Hick’s law is about choice reaction time, not decision time as is commonly thought.
• The law presumes that correct answer is known and is not something that should be thought about or discovered. (Subjects undertook a training before running the experiment.)
• The law is not universal. There are many situation when it does not apply.