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Salticidaes Vision(jumping spiders)

Salticidaes Vision(jumping spiders). Group 1: Chingyee, Hilmi, Anthony. Overview . Eye Structure Colour Vision Survival Methods Summary. Eye Structure. Eye Structure.

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Salticidaes Vision(jumping spiders)

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  1. Salticidaes Vision(jumping spiders) Group 1: Chingyee, Hilmi, Anthony

  2. Overview • Eye Structure • Colour Vision • Survival Methods • Summary

  3. Eye Structure

  4. Eye Structure Trapezoid formed by anterior lateral eyes (ALE) and posterior eyes (PE) such that the shorter edge is posterior (dorsal view)

  5. Internal structure of the eyes

  6. ???? Jumping Spider Colour Vision

  7. Colour Vision • Tetrachromacy • 4 colour cones • Sensitive from 300nm to 700nm • Layered retina • 4 layers • Outer 2 detect UV • Inner 2 detect green light

  8. Experiment!! • Particularly sensitive to green (520-540nm) and UV (360nm) • Colour of light affected • Accuracy • Distance http://www.youtube.com/watch?v=0ZwTEcbX1Eg&feature=player_embedded

  9. Survival Methods

  10. Defocusing for depth perception • Salticidaes (jumping spiders) gauge depth cues from the amount of defocus (comparing a blurry version of an image with a clear one)

  11. Defocusing for depth perception • Taking into consideration the layers' respective distances from the lens of the eye, incoming green light is only focused on the deepest layer, while the other green-sensitive retinal layer receives defocused or fuzzy images • The fuzzy layer is proportional to the distance an object is to the lens of the eye.

  12. Experiment!!! • ALE used in providing crucial warning to the spiders. • If the spider could detect the motion, it would respond by backing up rapidly, usually lifting up a couple of legs in a defensive posture • 3 groups of spiders (AME painted, ALE painted and no paint on the eyes)

  13. Experiment!!! • The spiders were put into an enclosure with an iPod touch. On the screen was a black dot. • When the spider was looking toward the screen, the researchers pressed play, and the dot either • expanded quickly (as if it coming toward the spider) or • contracted (as if receding).

  14. Experiment

  15. Summary • Labels of inner part of the eyes • The use of each eyes • Sensitive to green and UV • Layered retina • Defocus • Motion detection

  16. Thank you for your attention!

  17. Bibilo • http://jumpingspidersma.wordpress.com • http://wikis.evergreen.edu/m2o1112/index.php/Spiders_and_scorpions • http://www.earthtimes.org/scitech/green-light-jumping-spiders/1789/ • http://jeb.biologists.org/content/51/2/443.full.pdf • http://research.amnh.org/iz/blackrock2/families/salticidae.htm • http://salticidae.org/salticid/diagnost/general/eyes.htm

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