Download Perception Lecture unit6Perception

For cannabis or any drug, being schedule I
means:
1. It has high addiction
potential
2. It is dangerous to use in
any circumstances
3. It has no medical benefit
4. 1 + 2 + 3 according to
federal regulators
5. 1 + 2 are true, 3 is not
UNIT SIX
•Drugs that distort perception
•
What IS perception?
•
LSD and shrooms
How do we perceive?
Step 1: Sensation
Stimulation of sensory receptors
Chemicals – chemoreceptors
Pressure – mechanoreceptors
Light - photoreceptors
Sensation occurs before Perception
Sensation , NOT perception
Sense of Sight
Sensory receptors are not evenly
distributed.
Through which structure does most sensory
information pass on its way to the cerebrum?
1.
2.
3.
4.
5.
6.
Thalamus
Hypothalamus
Optic chiasm
Hippocampus
Cerebellum
Olfactory Bulb
How is sensory information received in
the brain?
Audesirk Figure 33.12
Audesirk Figure 33.14
Eye stimulus goes first to thalamus
From thalamus – info goes to visual
cortex
Sensory Routing is Fixed- let’s try an
experiment:
finger
closed eye
Figure 9-21 The Visual Pathways.
Combined Visual Field
Left side
Right side
Perceived as
coming from
over here
Left
eye
only Binocular vision
Right
eye
only
The Visual
Pathway
Photoreceptors
in retina
You push here
Retina
Optic disc
Optic nerve
(N II)
Optic chiasm
Optic tract
Thalamic
nucleus
Hypothalamus,
pineal gland,
and reticular
formation
Projection fibers
Visual cortex
of cerebral
hemispheres
Left cerebral
hemisphere
© 2013 Pearson
Education, Inc.
Superior
colliculus
Right cerebral
hemisphere
How do we perceive touch?
Consider the sheep
How do we perceive?
Once messages gets
to, and is interpreted
BY the brain, then
we perceive.
What if….?
Phantom limbs: there is feeling, but no limb
What if….?
How many “2”s are there?
Are illusions hallucinations?
Are illusions hallucinations?
Are illusions hallucinations?
http://www.michaelbach.de/ot/col_lilacChaser/index.html
Are illusions hallucinations?
http://www.michaelbach.de/ot/lum_white-illusion/index.html
http://michaelbach.de/ot/mot_feet_lin/index.html
Are illusions hallucinations?
http://www.michaelbach.de/ot/sze_muelue/index.html
http://www.michaelbach.de/ot/mot_ske/index.html
Which illusion is explained by tired photoreceptors?
1. A
2. B
finger
closed eye
3. C
4. D
5. E
Which illusion shows that our sensory pathways
follow specific “wiring” routes?
1. A
2. B
finger
closed eye
3. C
4. D
5. E
Which drugs alter perception?
http://mushroom.dk/svampe/pictures/gutmann_202.jpg