PSYC 129 Midterm 2 Study Guide.docx

Stereo vision adding depth and the popping out of an

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Stereo Vision – Adding depth and the ‘popping out’ of an image; this is a kind of 3D, where you wear red in one eye and blue in the other eye and look at an image to create a depth of field. What this does is create two similar images, only separated slightly and funneling out one color to the eye and another color to the other. We then fuse these two images together and we overlay them in our head together; thus 3D. At this point, think of a red/blue 3D image. Multiple same images fuse together in your mind and make it extend out to you. Random-Dot Stereograms – Looking at two separate random dot plots, we do not get any real depth. This is because MONOCULAR FORM RECOGNITION DOES NOT PRECEDE BINOCULAR MATCHING. The dots may look random, but the red/blue mixing allows these dots to have a shape. Red and blue dots can form a square among other black and white dots PRE-Julesz – Left or Right eye --- Left or Right eye Monocular Object recognition --- Fuse together at Binocular Combination --- stereopsis POST-Julesz – Left or Right eye --- Fuse together at binocular combination --- Stereopsis --- object recognition Week 8: Reading: Ramachandran, Blind Spots ; visual plasticity ; scotomas ; “filling in” Blind Spots Paper: Filling in - When surrounding images fill in color of blind spot Scotomas - regions of blind spots that are caused by damage to small portions of the brain Red and green line seems continuous but subjects cannot identify spot where the colors actually change. Filling in can be influenced by stimuli distant from the blind spot X with one longer line However for the vertical dots, we do not fill in when on is missing Filling in depends on whether illusory contours are well defined When does filling in occur? Early in visual processing since it proceeds popping out (disk focused on blindspot was homogenous, others were not) Filling in precedes detection of motion (Diagonal shift visual) Static square disappears because of overstimulation to neurons which are usually not overstimulated because of movement of eye. Set of neurons generates a representation and Representation can persist (switched to gray) -Filling in is not cognitive
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Week 9: Constancy in visual illusions Subject Constancy: Also known as perceptual constancy; an object or quality is constant even though our sensation of the object changes. Though the physical characteristics change, we try to adjust the stimulus. For an example; we see two different lines on a train track, one closer and one further. The further one looks larger, but they’re the same size because the distance from them creates this illusion of growth. Size constancy - the actual size of an object does not change. Though it can be bigger or smaller from the actual existence. Like taking a photo of a person from the feet up, we can see huge feet and a small head, when in actuality, it is just a distort.
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