Mid-year assistance thread

[d0minicz]

hmmm but the left half of the right eye goes to the left hem and right half to right hem
cuz it says right eye not right visual field
maybe it has something to do witht he dorsal stream but i dunnno .....

[mypurpleundercracka]

hmmm but the left half of the right eye goes to the left hem and right half to right hem
cuz it says right eye not right visual field
maybe it has something to do witht he dorsal stream but i dunnno .....

whats dorsal stream? never heard of it lol

[d0minicz]

lol it connects to the visual cortex and is involved in determining "where" a visual stimulus is located. its in the parietal lobe.
the ventral stream is involved in determining "what" a visual stimulus is, and its located in the temporal lobe

[jess3254]

hmmm but the left half of the right eye goes to the left hem and right half to right hem
cuz it says right eye not right visual field
maybe it has something to do witht he dorsal stream but i dunnno .....

Nah, it's a typo. Just ignore it, you don't need to know anything about the dorsal stream.

[mypurpleundercracka]

yeah it prob should say right and left occipital lobes

[d0minicz]

oh okay thanks guys

[jess3254]

I think that for sure they'll ask us to draw something... apparently they said at the examiners lectures that it hasn't been done and it is "quite possible" they'll include it at some point...
Drawing things is always so risky and ambiguous...

Can anyone explain the ames room in tums of apparent distance theory?
Its not clicking in my brain!!
Thanks

sorry about delayed response.
Basically, all you need to know is:
-The room appears to be cubic shaped, even though it is trapezoid
-The corners of the room appear to be at the same distance (think of it as the apparent LACK of distance theory), even though one is double the distance from the viewer than the other corner.
-The object that casts the larger retinal image (i.e. from the physically nearer corner) is perceived as larger than the object in the opposite, more distant corner. So, we don't maintain size constancy
-But we maintain shape constancy because we perceive the room to be cube rather than trapezoid.

The key to that theory is that the back corners of the room appear to be at the SAME distance from the viewer. So it's kinda like the opposite to Muller Lyer in a way, where it's incorrectly perceived as being at DIFFERENT distances.

[clauudia]

hey jessie0
can you also please explain the apparent and compromise theory for muller lyer?
ty

[jess3254]

hey jessie0
can you also please explain the apparent and compromise theory for muller lyer?
ty

Hey,
take a look at this thread here: http://vcenotes.com/forum/index.php/topic,13135.msg146127.html#msg146127

I posted a detailed response a while back. See if that helps. If not, just let me know =)

[clauudia]

so compromise: the horizontal lines are equal, but bc we use closer, the feather ends is longer?
and apparent: the ends add depth -> each line has a different distance  -> feather ends further away, so we assume its longer?

thanks
 

[d0minicz]

can soemone explain the time it takes for the cones and rods to adapt to a dark environment
thanks

[jess3254]

can soemone explain the time it takes for the cones and rods to adapt to a dark environment
thanks

You don't need to know much about dark adaptation because it isn't on the study design, however:
-It takes about 30-35 minutes of complete darkness for humans to reach a 'maximum visual sensitivity'
-A completely dark-adapted eye is 100 000 times more sensitive to light

[mypurpleundercracka]

do fMRI and PET scan provide info on structure as well?

[jess3254]

do fMRI and PET scan provide info on structure as well?

fMRI = Yes: provides images of brain anatomy
PET = No: only provides a colour coded map of brain activity, no anatomy.

[d0minicz]

OOOopps i meant for cones and rods
like if you enter a dark room, would the cones adapt quickly? and what about the rods?
sorry there
thanks =]