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PSY 252 -PERCEPTUAL PROCESSES MIDTERM EXAM
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PSY 252 -PERCEPTUAL PROCESSES MIDTERMEXAM 2024-2025
occurs when an image moves across receptors in the retina
motor signal or image displacement signal? - ANSWER image displacement signal
Detecting Motion: Say you are studying in a quiet area on campus and a person
walks by you but your eyes stay stationary looking at your computer in front of
you. You're still aware that somebody just walked by, but you didn't avert your
gaze to look directly at them and follow them with your eyes as they pass by.
What signal gets sent to your brain in this scenario?
Image displacement signal (IDS)
OR
Motor Signal/Corollary discharge signal (CDS) - ANSWER Image displacement
signal (IDS): the image being the person passing by is signalling a displacement.
AKA something is disrupting your visual field and what is disrupting it is the guy
that walks by you.
occurs when a signal is sent from the brain to move the eye muscles
motor signal or image displacement signal? - ANSWER Motor Signal
What happens after a motor signal is generated in your eyes that allows you to
move your eyes?
A c_________ copy of that motor signal gets sent to your brain (part of your brain
stem) and that c_______ copy of the motor signal is referred to as a c__________
d_________ s_______ (CDS). - ANSWER carbon copy x2 ....
referred to as a corollary discharge signal.
Detecting Motion: Say you are studying in the quiet area on campus and a person
,walks by you and you think you know them so you look at them and start following
them with your eyes as you try to determine if they are someone you know. (AKA
you keep them in the center of your visual field).
What signal(s) gets sent to your brain in this scenario?
Image displacement signal (IDS)
OR
Motor Signal/Corollary discharge signal (CDS) - ANSWER Motor
Signal/Corollary discharge signal (CDS)
1. moving your eyes via our extra ocular eye muscles to follow the person evokes
the motor signal
2. A carbon copy of that motor signal gets sent to part of your brain stem and that
carbon copy of the motor signal is referred to as a corollary discharge signal.
Movement perception depends on three signals:
1. I________ D___________ S________
2. M________ S________ ---> C____________ D_________ S_______ -
ANSWER Image displacement signal
motor signal/corollary discharge signal
A copy of the motor signal is referred to as c___________ d__________
s________ - ANSWER corollary discharge signal
What neural mechanism in the brain is responsible for receiving image
displacement signals and corollary discharge signals?
C______________ - ANSWER Comparator (perceived movement depends on the
signals that are received by the comparator).
In which situation do you NOT perceive motion?
When you comparator receives...
,1. an Image displacement signal
2. an corollary discharge signal
3. both an image displacement signal and corollary discharge signal - ANSWER 3.
when your comparator receives both an image displacement signal and corollary
discharge signal
perception-action cycle - ANSWER -our actions are determined by the patterns of
motion we perceive
-the patterns of motion we perceive are determined by our actions
Jenny is in an experiment where there is two conditions.
1. Eyes Open
2. Eyes Closed
The task is simple. Jenny is shown a target line and is asked to try and draw a line
that matches the length of that target line.
Was Jenny better at matching the target line when her eyes were open or closed?
What happened when the experimenter (Woodworth) increased the speed? -
ANSWER Open: visual feedback provides the brain with more resources and helps
our actions to be more accurate
Regardless of getting visual feedback (eyes open) or not their ability to draw an
accurate comparison line diminishes
What did Robert Woodworth conclude from his Speed-Accuracy Tradeoff
experiment?
clue: speed - ANSWER What he concluded was this visual feedback that we use to
do these different kinds of actions. As long as we do them relatively slowly than
were accurate but when you start to speed things up and start to push us then the
accuracy that's afforded through visual feedback is diminished.
If I am running, what depth perception cue would help me know I am running
AND help me maintain my balance in an upright position?
, Motion Parallax
Liner Perspective
Optic Flow
Relative Size - ANSWER Optic flow (the speed of the world travelling around us
and we use that to determine how fast we're moving or how fast the world is
moving around us).
Visual feedback: In 1974, infant Josh is in an experiment. He's told to stand in the
middle of a room where the walls could actually move and therefore, generate
o_____ f_____. What this did was trick the v_______ s_______ into thinking that
your moving.
How did this affect little josh's posture? - ANSWER optic flow
visual system
Because the walls were moving around him, the logical assumption is the reason
there moving is because I must be moving (yet you're stationary).
The affect of that is to trick you into feeling that you're moving and LOOSE YOUR
BALANCE or FALL OVER.
Perception through a wedge prism show us how reliant we are on v_______
f________ when performing an a______. - ANSWER visual feedback
action
Kate is in an experiment where she's asked to throw and hit a ball at a target wheel
while wearing prism glasses that distort your vision.
At first she's ....
After some practice... - ANSWER always throwing the ball way off to the left
we see Kate starts to make a correction of this displacement of the visual image.
She basically overrides what she's seeing and her accuracy gets better and better.
How do researchers know exactly where a participant is looking when their
viewing images on a computer screen?
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