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The Six Laws of Psychology for Good UX Design
Applying six core cognitive psychology principles can significantly reduce user error rates and improve task completion speeds in UX design.
What: The article outlines Hick's Law, Fitts' Law, Jakob's Law, the Von Restorff effect, the Peak-End rule, and the Aesthetic-Usability effect as essential frameworks for optimizing interfaces.
Why it matters: Systematic application of cognitive psychology is a proven way to improve measurable business metrics like conversion rates and support ticket volume.
Takeaway: Audit your current UI against these six laws to identify navigation or interaction bottlenecks.
Decoder
- Hick's Law: The principle that the time it takes for a person to make a decision increases with the number and complexity of choices.
- Fitts' Law: A model of human movement that predicts the time required to rapidly move to a target area is a function of the distance to the target and the size of the target.
- Jakob's Law: Users spend most of their time on other sites, meaning they prefer your site to work the same way as all the other sites they already know.
- Von Restorff Effect: The tendency for an item that 'stands out like a sore thumb' to be more likely to be remembered than other items.
- Peak-End Rule: A psychological heuristic where people judge an experience largely based on how they felt at its peak and at its end, rather than the total sum of the experience.
- Aesthetic-Usability Effect: A phenomenon where users perceive more aesthetically pleasing designs as more usable.
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