Neurons at Different Levels of the Visual System Have Very Different Receptive Fields Flashcards
Receptive Field
The stimulus region and features that affect the activity of a cell in a sensory system.
On-Center Bipolar Cell
A retinal bipolar cell that is excited by light in the center of its receptive field.
Off-Center Bipolar Cell
A retinal bipolar cell that is inhibited by light in the center of its receptive field.
Figure 7.12
Connections of Cones to Bipolar Cells
On-Center Ganglion Cell
A retinal ganglion cell that is activated when light is presented to the center, rather than the periphery, of the cell’s receptive field.
Off-Center Ganglion Cell
A retinal ganglion cell that is activated when light is presented to the periphery, rather than the center, of the cell’s receptive field.
On-Center/Off-Surround
Referring to a concentric receptive field in which stimulation of the center excites the cell of interest while stimulation of the surround inhibits it.
Figure 7.13
A.
Receptive Fields of Retinal Cells
An on-center/off-surround cell
Off-Center/On-Surround
Referring to a concentric receptive field in which stimulation of the center inhibits the cell of interest while stimulation of the surround excites it.
Figure 7.13
B.
Receptive Fields of Retinal Cells
An off-center/on-surround cell
Lateral Inhibition
The phenomenon by which interconnected neurons inhibit their neighbors, producing contrast at the edges of regions.
Figure 7.14
Lateral Inhibition in the Retina
Figure 7.15
The Effect of Context on the Percption of Brightness
Figure 7.16
A.
Receptive Fields of Cells at Various Levels in the Cat Visual System
Figure 7.16
B.
Receptive Fields of Cells at Various Levels in the Cat Visual System
Figure 7.16
C.
Receptive Fields of Cells at Various Levels in the Cat Visual System
Simple Cortical Cell
Also called bar detector or edge detector. A cell in the visual cortex that responds best to an edge or a bar that has a particular width, as well as a particular orientation and location in the visual field.
Complex Cortical Cell
A cell in the visual cortex that responds best to a bar of a particular size and orientation anywhere within a particular area of the visual field.
Figure 7.17
Receptive Fields Can Combine to Make More Complex Receptive Fields
Spatial-Frequency Model
A model of vision that emphasizes the analysis of different spatial frequencies, of various orientations and in various parts of the visual field, as the basis of visual perception of form.
Figure 7.18
Examples of Spatial Frequencies in Vision
Figure 7.19
A, and B.
Main Visual Areas in Monkey and Human Brains
Figure 7.19
C.
Main Visual Areas in Monkey and Human Brains
Figure 7.19
D.
Main Visual Areas in Monkey and Human Brains
Figure 7.20
A Geometric Figure with “Illusory” or “Subjective” Contours
Figure 7.21
Complex Stimuli Evoke Strong Responses in Visual Cortex
