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Vision Lecture.doc

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Christopher Teeter

Constructing the Visual World • Possibility that the brain is in a jar somewhere being stimulated • Sensation converts energy into nerve impulses – senses (ex. taste, touch, etc.) are info collecting devices that collect sensory stimuli and then transfer it into neural impulses that we can actually use • Perception is the neural info that our brain can actually use • Sensation is different than perception • 8 circles that are shaded (2 rows from different directions) – brain assumes there is a single light source • Rearrange circels – hills on left and holes on right – brain assumes light comes from above • If you flip upside down, the hills and holes switch – vestibular system recognizes that you are upside down so down is actually up • Rearrange circles all mixed together – pop out effect – see all hills/see all holes – brain assumes that like objects are grouped together o Important to be able to differentiate a lion blending into the grass for ex. o When you are shown 3 circles and a line arranged like a face – you assume it is a face even though it is really not o White dots on a black screen – brain groups them and recognizes a person walking when they are moving characteristic to a person walking but not when they are stationary • Light reflects off a stimulus through lens and hits retina upside down and backwards • Damage to retina makes the image blurred at that location • 3 layers: ganglion, bipolar, photoreceptors • Photoreceptors process info at the back – need nourishment – sends info back through the other layers after • Physical limitation of retina – can’t see 2 lines very close together (limit is about a pixel) because photoreceptors can only be so close • Visual acuity – clearness of the vision • Hyper acuity – tell the difference in position of lines – can be so exact that you feel you are guessing but you are doing it better than chance o Perform at a higher rate than your eye should be able to do physically o Most people dn’t realize they hae it until they are put under these controlled situations Primary Visual Cortex • Aka V1/striate cortex • Info from temporal side of eyes stays on that side • Info from nasal side of eyes crosses sides at the optic chiasm • Compress info down – many receptive fields of many retinal ganglion cell
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