Chapter+Five+-+Visual+Attention+and+Information+that+Pops+Out

= Chapter Five:  Visual Attention and Information that Pops Out =

- Greater target density causes the UFOV to be smaller and attention is more narrowly focused. Low target density result in a larger area that can be attended to.
== - Tunnel vision is associated with operators functioning under extreme stress. In tunnel vision, UFOV is narrowed thus only the most important information, usually at center of field of view, is processed. ==

- Ex: there could be an incoming message from a valued customer or indication that a major computational task has been completed. This kind of message is also known as "user interrupt."
There are four basic visual requirements for a user interrupt: - A signal should be easily perceived even if it is outside of the area of immediate focal attention. - If the user wishes to ignore the event while attending to another task, the signal should continue to remind the user that the event needs attention. - The signal should not be so irritating that it makes the computer unpleasant to use. - It should be possible to endow the signal with a variety of levels of urgency.