PSY 252-Perceptual Processes-Midterm
Exam Questions With Correct And Revised
Answers.
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 the 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 did just walk 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 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:
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
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