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PSYA01H3 Lecture Notes - Auto Racing, Color Blindness, Evolutionism

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Steve Joordens

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Psychology Lecture 22 (chapter 5, chapter 6)
Slide 33- the rods are ‘cleaned up’ by the retina
Rods and cones translate light into neural impulses, in which chemical reactions occur that are sensitive
to the lights and kick off the signals.
Slide 37- even when you focus on a spot between the T and O, your mind seems to explore around.
The after image had different colours. The Green sign looked purple, and the blue signs became yellow.
That’s because the ganglian might not necessarily fire on/off. When nothing’s happening, the rate of
firing shoots normal (resting state), but at different colours (ie. Green), the rate slows down. The rate
signals a colour. The green looked purple though because the firing rate abruptly slows down in order to
accommodate the quick disappearance of the colour overshoots.
How do we see yellow if we don’t have yellow cones? Both red and green cones are equally stimulated
when yellow is seen. The rate of firing will be between fast and slow. In other words, the yellow gun that
quadro tvs brag about do not have a purpose, since we don’t have yellow cones.
Colour blindness generally linked to red and green cones.
Slide 39: At level of retina much processing is happening. This is part of an argument against
evolutionism, since such a complex structure could not have appeared randomly. An analogy would be
looking at watches created today in the future- the intricacy of that watch must only have been made by
a watchmaker.
Slide 40: Audition- soundwaves are translated into neural impulses. The brain produces vibrations to the
throat and produces sounds that can be perceived by other people’s auditory systems. This is a method
of communication.
The ear is responsible of locating what is around you and not in front of you (the eyes are responsible to
the front). The ears on the side allow for a wide field of perception, and you can figure out movements
from behind and where they originate. That’s because sounds can hit one ear earlier than the other,
giving you a good assumption as to where the sound came from. Think of a racing car passing by- the
sound pushes closer together as it approaches you, and gives you higher notes. When the car leaves, the
sounds are further apart and so there are lower notes.
The eyes and ears work together in that you react to a sound and look at it to learn more about it.
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