The Retinofugal Projection Right and Left Visual Hemifields Neuroscience: Exploring the Brain, 3rd Ed, Bear, Connors, and Paradiso Copyright © 2007 Lippincott Williams & Wilkins

The Retinofugal Projection Targets of the Optic Tract Neuroscience: Exploring the Brain, 3rd Ed, Bear, Connors, and Paradiso Copyright © 2007 Lippincott Williams & Wilkins

Visual agnosia is an impairment in recognition of visually presented objects.

A scotoma (Greek σκότος/skótos, darkness; plural: scotomas or scotomata) is an area of partial alteration in the field of vision consisting of a partially diminished or entirely degenerated visual acuity that is surrounded by a field of normal – or relatively well-preserved – vision. A depiction of a scintillating scotoma that was almost spiral-shaped, with distortion of shapes but otherwise melting into the background similarly to the physiological blind spot, as may be caused by cortical spreading depression

V1 damage and scotoma and blindsight Smoked glass immediately Visual noise 4d after (snow on a television) Cortically blind or BLINDSIGHT Perceived location w/o being able to see content (B.K.) Normal color, line, angle, and motion perception (D.B.) Primary and secondary vision? Some brain regions function w/o consciousness? https://www.youtube.com/watch?v=4x0HXC59Huw https://www.youtube.com/watch?v=ny5qMKTcURE Blindsight is the ability of people who are cortically blind due to lesions in their striate cortex, also known as primary visual cortex or V1, to respond to visual stimuli that they do not consciously see (see Wiki).

Blindsight is the ability of people who are cortically blind due to lesions in their striate cortex, also known as primary visual cortex or V1, to respond to visual stimuli that they do not consciously see (see Wiki). Underlying mechanisms? Why such mechanisms? What does it tell us about?

Color blindness http://www.youtube.com/watch?v=XncZ3aPjXMY Color perception http://www.youtube.com/watch?v=evQsOFQju08 How color blindness is like http://www.youtube.com/watch?v=AUsups6Mk3I

Motion blindness (akinetopia) http://www.youtube.com/watch?v=B47Js1MtT4w Motion perception http://www.youtube.com/watch?v=tYFhDzQ1rYU

Face blindness http://www.youtube.com/watch?v=dxqsBk7Wn-Y Cases D and T: Higher-level visual processes Case D. Prosopagnosia (face blindness) Case T. Difficulty reading (alexia), naming, and lip reading Face blindness http://www.youtube.com/watch?v=dxqsBk7Wn-Y http://www.youtube.com/watch?v=q8cXus7SNQY https://www.youtube.com/watch?v=-vQGPcYfIAo

Disorders of visual pathways Disorders of cortical functions Visual agnosia Object agonsia Apperceptive agnosia Associative agonosia Other agnosias Prosopagnosia Alexia Visuospatial Agnosia Associative visual agnosia refers to a subtype of visual agnosia, which was labeled by Lissauer (1890), as an inability to connect the visual percept (mental representation of something being perceived through the senses) with its related semanticinformation stored in memory, such as, its name, use, and description