Interaction
Doherty Threshold
Rapid, meaningful system feedback helps sustain an interactive rhythm; the often-cited 400 ms value is historical guidance, not a universal boundary.
Psychology, behavioral science, perception, human computer interaction, and usability principles explained for working designers.
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Interaction
Rapid, meaningful system feedback helps sustain an interactive rhythm; the often-cited 400 ms value is historical guidance, not a universal boundary.
Usability
Outcomes are often unevenly distributed, so a minority of causes, tasks, or defects may account for a large share of observed impact.
Usability
Accept safe, unambiguous input variation where useful and produce predictable output, while rejecting ambiguity that threatens security or interoperability.
Attention
People can follow one information stream amid competition, while personally relevant unattended material may sometimes capture awareness.
Mental models
Information scent is the perceived value of a cue for predicting whether a path will lead toward the information a person seeks.
Mental models
People often stop searching when they encounter an option that meets an acceptable threshold rather than exhaustively finding the theoretical optimum.
Perception
Visual search performance depends on how a target is represented, how similar distractors are, and how attention is guided through the display.