Illusion

Slide1: 

<![CDATA[ Illusion The "maya" and the "pseudo-realities" refers to ]]>

Slide2: 

<![CDATA[ Can you guess this woman's age? Keep looking at the picture and see it change ]]>

Slide3: 

<![CDATA[ When you look at the figure you will see either a vase or two faces. If you continue to look, the figure will appear to shift to the alternative organization. ]]>

Slide4: 

<![CDATA[ In these images you will tend to see figures that are impossible to make from wood, plastic or other material. ]]>

Slide5: 

<![CDATA[ In this Illusion two straight lines run in parallel. However, the intersecting radial lines change the appearance of these parallel, straight lines. What occurs in your visual system that could account for the illusory appearance these lines? ]]>

Slide6: 

<![CDATA[ What occurs in your visual system that could account for the illusory experience of gray spots? ]]>

Slide7: 

<![CDATA[ Close one eye. Fix your gaze on either the top or bottom "X". View from a distance of about 80cm. Gradually move toward the screen while keeping your gaze fixed on the X. The eye pictured on the same side as the eye that you are using is the one that will disappear as you move toward the screen. The disappearance will occur when you are gazing from about 45 cm. and the projection falls on your blindspot. Hold your viewing distance constant and glance at the object that disappeared. You will see it when you look at it, but will not see it when the projection from it falls on your blindspot. The top figure works well on high resolution monitors and the bottom figure works best for low resolution monitors. ]]>

Slide8: 

<![CDATA[ Fixate on the red appearing dot. The two dimensional drawings give an appearance of three dimensional cubes. Ambiguity exists in the three dimensional information and as you continue to look, you will see a shift. Note which surface appears closest in each cube. Do the cubes shift independently or as a unit? What is the importance of the way that they shift? ]]>

Slide9: 

<![CDATA[ In one picture you can see linear perspective cues to depth. In the other picture, horizontal bluish appearing lines, which are all the same physical length, have been added and the Ponzo illusion is induced. The lines that appear to be further away also appear longer. ]]>

Slide10: 

<![CDATA[ Stare at the negative image on the left for 30 to 60 seconds. Then shift your gaze to the blank area to the right. In a short time you will see the image at which you stared converted. The phenomenon is known as negative afterimages. How is your visual system responding to produce such negative afterimages? Why does the afterimage seem to move? ]]>

Slide11: 

<![CDATA[ How do we see in depth given that the receptive surfaces of our eyes (retinas) are relatively planar? In binocular vision, the input to 2 eyes can be compared centrally for spatial disparties resulting from the different angles of regard of the two eyes. Binocular temporal disparities provide similar experiences to binocular spatial disparities. ]]>

Slide12: 

<![CDATA[ Stare at the black dot for 30 to 60 seconds. Then quickly change to stare at the white dot. While you are looking at the white dot, the black squares will seem stationary. But, you will also see a fainter grid of moving squares. ]]>