B6-Vision Flashcards
Sensory transduction
The process by which sensory stimuli are transduced into slow, graded receptor potentials
Sensory receptor
A specialized neuron that detects a particular category of physical events
Receptor potential
A slow, graded electrical potential produced by a receptor cell in response to a physical stimulus
Hue
One of the perceptual dimensions of color, the dominant wavelength
Brightness
One of the perceptual dimensions of color; intensity
Saturation
One of the perceptual dimensions of color; purity
Saccadic movement
The rapid, jerky movement of the eyes used in scanning a visual scene
Pursuit movement
The movement that the eyes make to maintain an image of a moving object on the fovea
Accommodation
Changes in the thickness of the lens of the eye, accomplished by the ciliary muscles, that focus images of near or distant objects on the retina
Retina
The neural tissue and photoreceptive cells located on the inner surface o the posterior portion of the eye
Rod
One of the receptor cells on the retina; sensitive to light of low intensity
Cone
One of the receptor cells of the retina; maximally sensitive to one of three different wavelengths of light and hence encodes color vision
Photoreceptor
On of the receptor cells of the retina; transduces photic energy into electrical potentials
Fovea
The region of the retina that mediates the most acute vision of birds and higher mammals. Color-sensitive cones constitute the only type of photoreceptor found in the fovea
Optic disk
The location of the exit point from the retina of the fibers of the ganglion cells that form the optic nerve; responsible for the blind spot
