scholarly journals Disruptive coloration in cuttlefish: a visual perception mechanism that regulates ontogenetic adjustment of skin patterning

2007 ◽  
Vol 210 (7) ◽  
pp. 1139-1147 ◽  
Author(s):  
A. Barbosa ◽  
L. M. Mathger ◽  
C. Chubb ◽  
C. Florio ◽  
C.-C. Chiao ◽  
...  
Keyword(s):  
Visual Perception ◽  
Disruptive Coloration

scholarly journals Predator perception and the interrelation between different forms of protective coloration

2007 ◽  
Vol 274 (1617) ◽  
pp. 1457-1464 ◽  
Author(s):  
Martin Stevens
Keyword(s):  
Visual Perception ◽  
Warning Coloration ◽  
Protective Coloration ◽  
Disruptive Coloration ◽  
Risk Of Predation ◽  
Motion Camouflage ◽  
Future Work

Animals possess a range of defensive markings to reduce the risk of predation, including warning colours, camouflage, eyespots and mimicry. These different strategies are frequently considered independently, and with little regard towards predator vision, even though they may be linked in various ways and can be fully understood only in terms of predator perception. For example, camouflage and warning coloration need not be mutually exclusive, and may frequently exploit similar features of visual perception. This paper outlines how different forms of protective markings can be understood from predator perception and illustrates how this is fundamental in determining the mechanisms underlying, and the interrelation between, different strategies. Suggestions are made for future work, and potential mechanisms discussed in relation to various forms of defensive coloration, including disruptive coloration, eyespots, dazzle markings, motion camouflage, aposematism and mimicry.

Cuttlefish camouflage: visual perception of size, contrast and number of white squares on artificial checkerboard substrata initiates disruptive coloration

2001 ◽  
Vol 204 (12) ◽  
pp. 2119-2125 ◽  
Author(s):  
Chuan-Chin Chiao ◽  
Roger T. Hanlon
Keyword(s):  
Visual Perception ◽  
Narrow Range ◽  
Body Form ◽  
Black Background ◽  
Sepia Pharaonis ◽  
Disruptive Coloration ◽  
Visual Background ◽  
On Line ◽  
Size Contrast

SUMMARY We investigated some visual background features that influence young cuttlefish, Sepia pharaonis, to change their skin patterning from ‘general resemblance’ of the substratum to disruptive coloration that breaks up their body form. Using computer-generated black/white checkerboard patterns as substrata, we first found that the size of the white squares had to be within a certain narrow range (relative to the size of the cuttlefish ‘white square’) for the animal to exhibit disruptive skin patterning. Second, given the appropriate size of checker, cuttlefish regulated their disruptive skin patterns according to the contrast between white and black squares. Third, by manipulating the number of white squares on a black background, we found that as few as four white squares among 316 black squares (or 1.25%) produced disruptive patterning, yet increasing the number of white squares to 20, 40 or 80 did not increase the frequency of appearance of the cuttlefish ‘white square’, but only its clarity of expression. These results demonstrate that the size, contrast and number of white objects in the surrounding substratum influence the production and expression of disruptive skin patterns in young cuttlefish. Movies available on-line

Development of visual perception and attention, assessed by backward masking and application in children with epilepsy

2003 ◽  
Vol 45 (08) ◽  
Author(s):  
Marta Macchi ◽  
Livia Nicoletta Rossi ◽  
Ivan Cortinovis ◽  
Lucia Menegazzo ◽  
Sandra Maria Burri ◽  
...  
Keyword(s):  
Visual Perception ◽  
Backward Masking

Review of The Psychology of Visual Perception. 2nd ed.

1981 ◽  
Vol 26 (3) ◽  
pp. 228-228
Author(s):  
Julian Hochberg
Keyword(s):  
Visual Perception
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