ch 10 Flashcards
the adequate stimulus for vision is light, which is a form of___energy
oscillating
how do our bodies use light to detect objects in the environment
??
the___is a circular muscle that controls how much light enters the eye. This muscle is what gives our eyes their color
iris
the light-sensitive cells in the eye are called___and are found in the___.
rods and cones; retina
some of your photoreceptors contain a photopigment called iodopsin. these photoreceptors require a high level of light to be active, but they provide your brain with information about color and can transmit highly detailed images. These photo receptors are called___
cones
which of these types of cells is NOT found in the retina?
Bipolar and ganglion cells ARE found in retina
why do we have a blind spot in each retina?
there are no receptors where the optic nerve exits the eye
the optic nerves from the two eyes come together under the pituitary gland before separating again and traveling to opposite sides of brain. This point of intersection, where information from the two visual fields combine, is called___
optic chiasm
information from the ___visual field is processed by the___ side of the brian
left; right and visa versa
what is the correct sequence of structures that visual signals move through on their way to the brain
optic nerve, optic chiasm, lateral geniculate nucleus, primary visual cortex
hurvich and jameson created a combined theory to try to account for both trichromatic and opponent process theories of color vision. Which of the following statements accurately describes that theory?
three types of color receptors (red, blue, and green sensitive) are interconnected in an opponent process fashion at ganglion cells
visual processing in the brain appears to be modular. this means that____
the segregation of the various components of processing into separate locations
visual information follows two routes to the brain. the ___system is specialized for discriminating fine details and color.
paravocellular
the stream of visual information moves from the visual cortex up to the parietal lobes. this stream contains mostly information from the magnocellular system, and is often called the “where” pathway because it mainly functions to detect where an object is and where it is moving
dorsal
after a severe car accident caused damage to his brain, Daniel has difficulties identifying objects that he sees. But, has no problems with accurately reaching for objects or avoiding running into things. This suggests that Daniel’s brain damage occurred somewhere in his___stream.
ventral
a recent fMRI exam discovered that Kristy has damaged her fusiform gyrus. This would explain her difficulties with___
recognizing familiar faces
the inferior (lower) temporal cortex appears to play a vital role in___
where information about edges, spatial frequencies, and texture is reassembled to form perceptions of objects
after a stroke damaged his right posterior parietal lobe, Carlos stopped paying attention to the left side of his world. he stopped shaving left side of his face, ignored food on left side of plate, and stopped dressing left side of his body. His stroke brought on a condition called___
neglect (hemispatial neglect)
The ___ is a flexible tissue at the front of the eye. it is attached to muscles that alter its shape, allowing us to focus on objects at different distances
cornea
___is a rare condition where individuals can respond to visual stimuli that they are not consciously aware of seeing. It occurs when V1 is damaged but visual input bypasses this area, moving directly from the superior colliculus to the other brain regions.
blindsight
