practice questions Flashcards
cells in the p pathway tend to have what?
higher contrast sensitivity than M cells at low temporal frequencies
the cells in the M pathways, at any given location in the visual field, prefer stimuli of?
lower spatial frequency and higher temporal frequency
a weaker m system in dyslexia is consistent with finding what?
lower contrast sensitivity at higher temporal frequencies and slower alternation rates are required to detect whether motion directions are alternating or both present in the same display
in reading, medium sized receptive fields extract information that what?
can show the breaks between words to direct eye movements
the dorsal visual pathway in the cortex processes what?
motion and position information and receives input predominately from the M pathway
the separation between cone photoreceptors is lowest where?
at the fovea
a just noticeable difference refers to?
the smallest change in signal intensity that can be detected when both stimuli are detectable
if the p pathway input to the visual system is removed by placing a lesion in the LGNd then flicker perception will?
be normal and colour perception will be poor
in receptive fields receiving inputs from fewer photoreceptors visual resolution and spatial summation are?
visual resolution is higher and spatial summation is poorer
when presbyopia affects vision, the near point recedes and is, on average, how many cm away by age 70?
400
in participants with dyslexia eye movement patterns are characterised by what?
longer fixation durations and more regressive eye movements
a hypercoloumn in V1 processes what?
all orientations in the image at one restricted location in the visual field
maxmimum meta contrast masking occurs when?
mask does not overlap the target in space and appears after the target.
the famous blindsight patient DB could what?
could discriminate between an X and O in a forced choice task
visual perimetry is used to?
measure sensitivity to contrast in different regions of the visual feild
