Exam 3: The Eye and Seeing

Which of the following phenomena is/are thought to be due to center-surround antagonism?

To establish the dark-adaptation curve of the rod system alone, you would present the test light

Electrical impulses carried by neurons are called

The average amount of convergence of receptors onto retinal ganglion cells is

If you needed an eye that would be particularly effective at low light levels, you should probably choose one that has a high concentration of

Some retinal ganglion cells respond only when the receptive field is stimulated by light of a particular color. They are called

If Frank were looking at a figure in which bright and dark regions are perceived within a single stripe, even though there is no variation in the physical distribution of light, he would be looking at

Under what conditions would you want to have a visual system that emphasized spatial resolution? What would be the costs of this emphasis?

Describe dark adaptation and explain its mechanism.

In vision, increased duration of a visual stimulus can be traded off for lower intensity. This is referred to formally as

Two objects identical in intensity could appear quite different in lightness under some conditions. This effect is termed

The notion that a particular intensity of light can cause various neural response levels is referred to as.

Which of the following is the most efficient light source?

Retinal ganglion cells with the smallest receptive field are found in the

The term "receptive field" refers to

As night falls, a red flower seems to fade in brightness compared to its green stem or leaves. This change in vision is called

What part of the spectrum would you pick to assure that photopic sensitivity was greater than scotopic sensitivity?

The property of the surface of an object that governs how much light it reflects is called

In receptive fields of retinal ganglion cells, the ratio of ON centers to OFF centers is

Describe two possible perceptual consequences of center/surround antagonism in retinal ganglion cells, and explain how these consequences come about.