Visual ScanningInfluenced by6 factors: 1 Habit 2 Attention capture 3 Info content: Event rate 4 Info content: Contextual relevance 5 Information value 6 Effort conservation
Visual ScanningProbability of looking at an area: Salience Effort Expectancy Value
vVisual Scanning s Visual Search
Visual SearchThe effort to detect a target itemwhose presence or position inthe field is not known a priori.
TargetWell-specified Vague Top-down Bottom-up
FieldStructured Predictable Haphazard In which type of field is it easier to find a target?
Facilitating Visual SearchHow can we design interfacesso it’s easier for people to find what they need?
A target is easier to find if… It is salient. It is novel or unfamiliar among familiar items. It possesses a unique feature rather than lacking it.* It (not the distractors) deviates from a default value.* Only one target needs to be sought at a time.