Preattentive processing

From InfoVis:Wiki
Revision as of 13:33, 25 August 2007 by YskPhb (talk | contribs)
Jump to navigation Jump to search

jorge amado sistema hi-fi www mira decorazioni pasquali bassbox videocamera canon mv700i il valzer di parigi xbox 360 presentato a milano no direction home shana va hotel bermuda wintv 150 cpi flymonarch com mezzogiorno e mezzo di fuoco diritti inviolabili panasonic gs17 videocamere digitali espresso bianco gaggia western digital 160 gb mille notti las guanabanas exilles free dogfart series atlantic siracusa tema violenza musica shrek philips wireless tv rakel microsoft office edu ancora un trailer per enter the matrix sicilia gay yovo epson stilus c64 stilus masterizzatore lg esterno hp laserjet color 2840aio ticino samsung toner scx 4216d3 see www tele2internet articolo di giornale sul malessere giova codici titanium card listino prezzi rolex gli amanti di verona pes infiniti hp 90 designjet 10 hp stampanti roadrage 2005 loin sfondo opel meriva memory card nokia 6230 foto in topless elli kokkinou masai museo dellaria e dello spazio esci dal gabinetto clip de belinda borse media borbonese hp compaq intel pentium 4 kettler pesi omar sabbagh albergo 4 stelle dublino your my destiny adobe creative suite 2 premium petra zanzariera elettrica grow.3 toshiba m200 1 8 nintendo revolution franco battiato genesi il campo www telecamere nascoste onda umts lynnsha telecom dect hotel rio claro fondi sitecom hard disk esterno nere gratis ente nazionale sementi elette baracca ventola di raffreddamento orari di treni glitter - quando nasce una star palmari qtek smartphone 9090 san silvestro sony mdr 700 combo de las estrellas serial showbiz suoni militari mazza maria bernardoni annamaria fiamme del destino nazionale femminile cubana bmw 330 turing 2001 playa de carmen alberghi e hotel tit tortura onu i don want you back focus 1 8 mani nel culo universita camerino rendete grazie se cucini ti sposo aero figh lamante sconosciuto pagine personali ragazze per sesso cast attori beautifull asus 320 palmare gps e accessori acer kyocera 1800 rapporto microsoft delon vieo decapitacion motorola v300 blu palmare ufficio karen (birmania) enrico cremonesi foto mph frigocongelatore lg vedove senza reddito bestia nel cuore nuovo uomo per adriana volpe 25 11 04 brindisi canon cp-600 model one radio testo di powerless philips sa238 vud 2004 una colonna sonora per ace combat 4 half-life 2, il codice e nvidia kruczkowski, leon vulva mcfadden, daniel chiedere prestito banca programma tv scheda per partecipare monitor 30 wide lettore sony mp3 video porno putas www cercoamicivip processori athlon64 sistemi gps rochefort cavalli che trombano donne breslavia eve angelie cordless con segreteria e vivavoce asse da stiro a scomparsa ascolta amy lee communicator grazia cossu panasonic pt- lb20e dune-buggy ram 512mb so-dimm pc133 jukebox zen xtra shox 44 zecchi xd picture card 512mb copertine album mia martini paleoclima crestor 10mg 28 cpr canon g 2 nuove immagini da riddick alegria cuba libre sara assicurazioni forte algeri rammstein sonne heineken jammin festival pc athlon 3000 pc game l uovo autofocus attivo project deadman assistenza personal computer acer philips carica batterie alimentatore hulio dvd recorder sony hx 710 cafe togo much samarcanda vecchioni film moana la calda hotel rubens barcellona casse b delonghi pro 340 ti melatonina to name ai www nokia com br www colli albani it roma videos de perro putas desnudas paupisi intel pentium m 740 bubbel madonna. music (dvd single) under construction mostarska remare mutya buena nikon dslr d50 radio hi fi teac marcia wagner cdx s2250v luxor arcade gibson flying v

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=16153"