The Retinofugal Projection Right and Left Visual Hemifields

The Retinofugal Projection • Right and Left Visual Hemifields Slide 2 Neuroscience: Exploring the Brain, 3 rd Ed, Bear, Connors, and Paradiso Copyright © 2007 Lippincott Williams & Wilkins

The Retinofugal Projection • Targets of the Optic Tract Slide 3 Neuroscience: Exploring the Brain, 3 rd 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

V 1 damage and scotoma and blindsight • V 1 damage • Smoked glass immediately • Visual noise 4 d 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=4 x 0 HXC 59 Huw https: //www. youtube. com/watch? v=ny 5 q. MKTc. URE Blindsight is the ability of people who are cortically blind due to lesions in their striate cortex, also known as primary visual cortex or V 1, 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 V 1, 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=Xnc. Z 3 a. Pj. XMY Color perception http: //www. youtube. com/watch? v=ev. Qs. OFQju 08 How color blindness is like http: //www. youtube. com/watch? v=AUsups 6 Mk 3 I

Motion blindness (akinetopia) http: //www. youtube. com/watch? v=B 47 Js 1 Mt. T 4 w Motion perception http: //www. youtube. com/watch? v=t. YFh. Dz. Q 1 r. YU

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=dxqs. Bk 7 Wn-Y • http: //www. youtube. com/watch? v=q 8 c. Xus 7 S NQY • https: //www. youtube. com/watch? v=v. QGPc. Yf. IAo

Disorders of visual pathways Disorders of cortical functions Visual agnosia Object agonsia Apperceptive agnosia Associative agonosia Other agnosias Prosopagnosia Alexia Visuospatial Agnosia