Preattentive processing

From InfoVis:Wiki
Revision as of 05:53, 15 July 2007 by YskPhb (talk | contribs)
Jump to navigation Jump to search

mp3 ringtones cheap soma cheap ultram ambien online buy vicodin vicodin online free funny ringtones zanaflex buy albuterol nexium online buy propecia ambien nokia ringtones alprazolam online viagra online cheap ultracet hoodia online cyclobenzaprine online free ringtones phentermine online cheap soma real ringtones free jazz ringtones vicodin online zyban online free ericsson ringtones sagem ringtones diazepam online sharp ringtones cingular ringtones but adipex verizon ringtones qwest ringtones cheap clonazepam zanaflex online free mtv ringtones mtv ringtones free kyocera ringtones free sony ericsson ringtones cheap tenuate free real ringtones cheap valium paxil online didrex online cheap sildenafil free nextel ringtones midi ringtones ativan online xanax cyclobenzaprine online order lorazepam alltel ringtones cheap didrex mp3 ringtones cingular ringtones tracfone ringtones buy xanax tracfone ringtones order norco order fioricet cheap lorazepam free free ringtones cheap viagra free wwe ringtones buy xanax cheap zoloft free free ringtones cheap sildenafil xenical online free samsung ringtones cheap prozac ultracet online norco online but lipitor motorola ringtones sagem ringtones meridia online but hydrocodone cheap diazepam ativan online norco online cheap prozac free sonyericsson ringtones qwest ringtones cheap lisinopril cheap didrex cheap ultram cialis online alprazolam online nextel ringtones cool ringtones lortab online nextel ringtones cheap zyban pharmacy online online cheap xanax online ativan sprint ringtones ativan online sprint ringtones wellbutrin online buy zanaflex buy carisoprodol cheap propecia buy prozac valium online cheap xanax motorola ringtones but ortho cheap wellbutrin levitra online fioricet samsung ringtones ortho online free cool ringtones lorazepam online celexa online tramadol online free polyphonic ringtones cheap zanaflex nokia ringtones cheap ortho samsung ringtones soma online lorazepam online free sagem ringtones sprint ringtones buy lipitor mp3 ringtones free sprint ringtones buy vigrx polyphonic ringtones cheap lisinopril free mp3 ringtones order viagra free cingular ringtones tenuate online kyocera ringtones qwest ringtones norco online buy clonazepam cheap sildenafil nextel ringtones funny ringtones cialis cheap ultracet free sprint ringtones cheap diazepam free free ringtones samsung ringtones free free ringtones cheap hydrocodone cheap tramadol ambien online mtv ringtones motorola ringtones free funny ringtones free music ringtones free cool ringtones fioricet online free real ringtones lorazepam online cheap soma clomid online clonazepam cheap paxil cheap lisinopril samsung ringtones sonyericsson ringtones cheap phentermine alltel ringtones free sprint ringtones clonazepam online didrex online ultram online verizon ringtones celexa online but norco diethylpropion online cheap tenuate free verizon ringtones cheap lipitor buy diazepam free verizon ringtones adipex online meridia online samsung ringtones cingular ringtones online clomid lisinopril online cheap carisoprodol paxil online free ericsson ringtones mono ringtones albuterol online ericsson ringtones ambien online levitra online didrex online midi ringtones

Preattentive processing of visual information is performed automatically on the entire visual field detecting basic features of objects in the display. Such basic features include colors, closure, line ends, contrast, tilt, curvature and size. These simple features are extracted from the visual display in the preattentive system and later joined in the focused attention system into coherent objects. Preattentive processing is done quickly, effortlessly and in parallel without any attention being focused on the display.
[Treisman, 1985, Treisman, 1986]


Typically, tasks that can be performed on large multi-element displays in less than 200 to 250 milliseconds (msec) are considered preattentive.
[Healey, 2005]


Taking advantage of preattentive processing in information visualization can greatly improve intuitiveness of representations yielding in a faster and more natural way of acquiring information.

Visualization is so effective and useful because it utilizes one of the channels to our brain that have the highest bandwidths: our eyes. But even this channel can be used more or less efficiently. One special property of our visual system is preattentive processing.
[Kosara, 2002]


One very interesting result of vision research over the past 20 years has been the discovery of a limited set of visual properties that are processed preattentively (i.e. without the need for focused attention). Typically, tasks that can be performed on large multi-element displays in 200 milliseconds or less are considered preattentive.This is because eye movements take at least 200 milliseconds to initiate. Any perception that is possible within this time frame involves only the information available in a single glimpse. Random placement of the elements in the displays ensures that attention cannot be prefocused on any particular location. Observers report that these tasks can be completed with very little effort.
[Healey et al., 1996]


Preattentive Features

A partial list of preattentive visual features, together with references to research that showed they were preattentive.[Chipman, 1996],

Detecting the Red Object preattentively.[Healey et al., 1996] One visual variable and very easy to find it.




Detecting the Circle preattentively.[Chipman, 1996] It is more difficult but still preantentiv.



Examples of two target detection tasks: (a) target can be detected preattentively because it possess the feature “filled”; (b) target cannot be detected preattentively because it has no visual feature that is unique from its distractors.[Healey et al., 1996]



Region segregation by form and hue: (a) hue boundary is identified preattentively, even though form varies randomly in the two regions; (b) random hue variations interfere with the identification of a region boundary based on form.[Healey et al., 1996]

Conclusion

Any visual processing of that item prior to the act of selection can be called “preattentive”.[Wolfe, Treisma, 2003]

Preattentive processing can help to rapidly draw the focus of attention to a target with a unique visual feature (i.e., little or no searching is required in the preattentive case). [Healey, 2005]


External Links

References

Retrieved from "https://infovis-wiki.net/w/index.php?title=Preattentive_processing&oldid=14978"