PSYC 213 Lecture Notes - Lecture 5: Visual Agnosia, Optical Illusion, Ebbinghaus Illusion
Sensation: energy from a physical stimulus in the environment that is picked up by sense organs. When the brain organizes sensed information and translates it into something meaningful. Last class: from the eyes to the brain. Light waves enter the eye and are focused onto the retina, a thin layer of tissue at the back of the eye. Photoreceptors (i. e. , rods and cones) in the retina convert light to electrical activity. This electrical signal is sent to bipolar cells then ganglion cells. The signal exits through the optic nerve to be sent to the brain. Brain injury that results in the inability to recognize objects that are perceived. So we cannot say that it is blindness, but they can(cid:495)t recognize or label an object. Dissociation between being able to see visual features and interpreting those visual features. Can be selective to particular types of processing. There are cases of selective deficits in visual recognition.