Medicine:Navon figure
A Navon figure is made of a larger recognisable shape, such as a letter, composed of copies of a smaller different shape. Navon figures are used in tests of visual neglect.[1] David Navon's research demonstrated that global features are perceived more quickly than local features.[2] Jules Davidoff also performed research, but in a remote culture, finding opposite results; the participants more readily identified the local features.[3] Patients with simultanagnosia have difficulty identifying global features, and when presented with a Navon figure will identify only the local features.[4] A 2010 study comparing global-local processing in different races,[5] found that East Asians demonstrated significantly stronger global processing than Caucasians.
Example
A letter T (global) composed of repeat copies of the letter S (local).
SSSSSSSSSSSSSSSSSSSSSSSSS
SSSSSSSSSSSSSSSSSSSSSSSSS
SS SSSSS SS
SSSSS
SSSSS
SSSSS
SSSSS
SSSSS
SSSSS
SSSSSSS
SSSSSSSSSSSSS
Reading Navon figures has been found to affect a range of tasks. It has been shown that just 5 minutes reading out the small letters of Navon figures has a detrimental effect on face recognition.[6][7] The size of the Navon effect has been found to be influenced by the properties of the image.[8] The effect is short lived (lasting less than a couple of minutes).[9]
The Navon effects has also been found in other tasks such as golf putting where reading the small Navon letters leads to poorer putting performance.[10]
See also
- ASCII art
References
- ↑ Assessing Attention in Unilateral Neglect, http://ahsmail.uwaterloo.ca/~aktse/assessment.html[yes|permanent dead link|dead link}}]
- ↑ Navon, 1977 cited in (1)
- ↑ Davidoff, J.; E. Fonteneau; J. Fagot (Sep 2008). "Local and global processing: Observations from a remote culture". Cognition 108 (3): 702–709. doi:10.1016/j.cognition.2008.06.004. PMID 18662813.
- ↑ Simultanagnosia, 2009, http://joeltalks.com/index.php?p=1_16
- ↑ Macrae, C. N.; Lewis, H. L. (2002). "Do I know you? Processing orientation and face recognition". Psychological Science 13 (2): 194–196. doi:10.1111/1467-9280.00436. PMID 11934008.
- ↑ Perfect, Timothy J. (2003-10-01). "Local processing bias impairs lineup performance". Psychological Reports 93 (2): 393–394. doi:10.2466/pr0.2003.93.2.393. ISSN 0033-2941. PMID 14650660.
- ↑ Perfect, Timothy J.; Weston, Nicola J.; Dennis, Ian; Snell, Amelia (2008-10-01). "The effects of precedence on Navon-induced processing bias in face recognition". The Quarterly Journal of Experimental Psychology 61 (10): 1479–1486. doi:10.1080/17470210802034678. ISSN 1747-0218. PMID 18609403.
- ↑ Hills, Peter J.; Lewis, Michael B. (2007-04-01). "Temporal limitation of navon effect on face recognition". Perceptual and Motor Skills 104 (2): 501–509. doi:10.2466/pms.104.2.501-509. ISSN 0031-5125. PMID 17566440.
- ↑ Lewis, Michael B.; Dawkins, Gemma (2014-08-08). "Local Navon letter processing affects skilled behavior: A golf-putting experiment" (in en). Psychonomic Bulletin & Review 22 (2): 420–428. doi:10.3758/s13423-014-0702-6. ISSN 1069-9384. PMID 25102927. http://orca.cf.ac.uk/64408/1/Navon%20Golf%20Post%20Print.pdf.
- Mevorach, Carmel; Humphreys, Glyn W.; Shalev, Lilach (2006). "Opposite biases in salience-based selection for the left and right posterior parietal cortex". Nature Neuroscience 9 (6): 740–742. doi:10.1038/nn1709. PMID 16699505.
- Navon, David (1977). "Forest before trees: The precedence of global features in visual perception". Cognitive Psychology 9 (3): 353–383. doi:10.1016/0010-0285(77)90012-3. http://cvcl.mit.edu/SUNSeminar/Navon_global_CP77.doc.
External links
 |  |
