1,4,6 receive information from the left eye
2,3,5 receive information from the right eye
1,2 = magnocellular
3-6 = parvocellular
Light layers = koniocelluar
of CO-rich neurons in the V2 area consists of three types of stripes: thick, thin, and pale stripes.
within the blobs are sensitive to color, and all of them are sensitive to low spatial frequencies.
lob, neurons show sensitivity to orientation, movement, spatial frequency, and binocular disparity.
Taken directly from Physiology of
edition by Neil Carlson
Chapter 6: Vision
Chapter 6 covers the topic of vision. The opening section introduces the topics of sensory processing and
the anatomy of the primate visual system, including the anatomy of the eye, the photoreceptors within the
retina, and the neural pathways that connect the retina to visual cortex. The second section of the vision
chapter introduces the notion of receptive fields and describes the organization of the retinal receptive
fields. The processing of color coding at the retina and the lateral geniculate is described. Negative
afterimages are related to retinal ganglion cell activity. The third section of chapter 6 describes the role
played by the striate cortex in processing of information related to orientation and movement, texture, and
color. Spatial frequency analyses are discussed in relation to visual processing.
The blindsight phenomenon is discussed as an example of how sensory processing can occur in the
absence of conscious awareness. The final section of chapter 6 introduces the notion that visual
processing may occur in two streams of analysis that involve the activity of multiple brain regions, some
located within striate cortex and others situated within visual association cortex. The section covers the
role of visual association cortex in the analysis of color, form, movement, and location.
- a specialized neuron that detects a particular category of physical events
Stimuli impinge on the receptors and, through various processes, alter their membrane potentials
– the process by which sensory stimuli are transduced into slow, graded receptor
– a slow, graded electrical potential produced by a receptor cell in response to a
Most receptors lack axons; a portion of their somatic membrane forms synapses with the dendrites of
Eyes detect light as electromagnetic radiation with a wavelength between 380 and 760 nm
– one of the perceptual dimensions of color; the dominant wavelength; color
– one of the perceptual dimensions of color; intensity
– one of the perceptual dimensions of color; purity