People tend to fixate first on high contrast or unique (relative to the surrounding area) points in a visual scene. This is a result of and is a process.

stimulus salience; bottom-up

Explanation:

Stimulus salience: In psychology, the term "stimulus salience" is defined as different features of specific objects in the surrounding environment that tends to attract an individual's attention. Salience may involve any of the feature's number such as fast movement, bright colors, and personal prevalence, etc,

Bottom-up processing: In psychology, the term "bottom-up processing" is determined as a phenomenon in which sensory information is being processed as soon as it comes in.