Notes made for the overall subject of perception and hearing in a psychological context. Topics covered include the basics of seeing, colour vision, motion perception, the third dimension, attention processes and hearing processes. These notes helped me achieve a first in my exam.
putorial
A cull
main: How we see
Attention
main:
Sub:"light +
retinas
Sub:*Covert
fields
receptive
·
paradigm
the
*
LGN
*
exogenous, endogenous
spatial
a vision *
change bundness.
·
Beyond theVI object/space selection
A
Objectis projected ontoretine which
generated image. We infer the projected umage using assumptions
prur knowledge.
+
wereggn Psychophysics
A -
tries to determine
stemmus +
the relationship between
n
- perception quantitary concerns thresholds
-
+ LUMCS.
Absolute threshold
measured with a forced choice;
Ps shown 2 stimuli -/ with pattern. Ps asked which has a pattern.
ume
*
adjusteduntil threshold is met. Threshold:contrastlevel that
contract
leads to performance.
↳me Threshold measured using reference
comparison As comparison
+ -
keeps is asked abtpatterns contracts. Referred to
changing, ps as I noticeable
difference. (IND)
↓
me JND is proportionate depends on intensity
+
weber fraction
StemmS
of used
ememe JND:
20g then
weight 100g.
- =
Electrophysiology looks & undividual neurons the processing
-
+
↳ neurons communicate potentials.
via action
We
Me
ne
de A
last
layer of retend has
Retinal Ganguon
cells
↳
RGCs send
signals magnocellular-lorge, parrocellular-small
to the Lateral Geruculate
Nuclea) (LGN) -
IGN 12 =
relay station btwn
eye
+ cortex
-
Sim3
At leastSO. ofbrain
Is dedicated to second,
why
-
which is it IS
·razy.
, Si
I the VI, neurons are
in
Vision
organeed into layers layers -
recieve inputfrom diff areas.
Retinotopy:sites activated by neighbouring relationships
↓
neurons stacked
respond to the same orientation -
neurons have preferences of the
eye they respond to
-
they are located together
Hypercolumn:All
orcentation
↑
+
neurons
size
respond to the same visual space
eg
date
me e
used to measure
#
how neurons respond to
size+
contrast.
times cower changel
Visual Angle: =cycles per image
tells size us the
ofretinal image
* local lightextensity
deff:contract
We only have *
undal so
retund
Phall:where cycle starts
Every
*
image can
object
size of
can change, despit bebroken done, routerane
objectstaying same images ontothe
We gratings. The Visua
3
were VH tO system does thes
quantify size of
The
retinal image
*
hypercolums
spatial
extract freQ
+
orientations contained
in the local patch
... a
conduct
fourier analyz
the neurons respond
to their different
components
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