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Sensory Receptor
A specialized neuron that detects a particular category of physical events. TERM 2
Sensory Transduction
DEFINITION 2 The process by which sensory stimuli are transduced into slow, graded receptor potentials. TERM 3
Receptor Potential
DEFINITION 3 A slow, graded electrical potential produced by a receptor cell in response to a physical stimulus. TERM 4
Hue
DEFINITION 4 One of the perceptual dimensions of color, the dominant wavelength. TERM 5
Brightness
DEFINITION 5 One of th perceptual dimensions of color, intensity.
Saturation
One of the perceptual dimensions of color, purity. TERM 7
Saccadic movement
DEFINITION 7 The rapid, jerky movement of the eyes used in scanning a visual scene. TERM 8
Pursuit Movement
DEFINITION 8 the movement that the eyes make to maintain an image of a moving object on the fovea. TERM 9
Accomodation
DEFINITION 9 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. TERM 10
Retina
DEFINITION 10 The neural tissue and photoreceptive cells located on the inner surface of the posterior portion of the eye.
Ganglion Cell
A neuron located in the retina that receives visual information from bipolar cells; its axons give rise tot he optic nerve. TERM 17
Horizontal cell
DEFINITION 17 neuron in the retina that interconnects adjacent photoreceptors and outer processes of the bipolar cells. TERM 18
Amacrine cell
DEFINITION 18 a neuron in the retina that interconnect adjacent photoreceptors and the outer processes of the bipolar cells TERM 19
Lamella
DEFINITION 19 a layer of membrane containing photo pigments; found in rods and cones of the retina TERM 20
Photopigment
DEFINITION 20 A protein dye bonded to retina;, a substance derived from vitamin A; responsible for transductions of visual information
Opsin
A class of protein that together, with retinal, constitutes the photopigments. TERM 22
Retinal
DEFINITION 22 Joins with an opsin to form a photopigment TERM 23
Rhodospin
DEFINITION 23 A particular opsin found in rods TERM 24
Receptive Field
DEFINITION 24 the portion of the visual field in which the presentation of visual stimuli will produce an alteration in the firing of a particular neuron
