chapter 5

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Published on 23 Oct 2011
School
UTSG
Department
Physiology
Course
PSL201Y1
Professor
Chapter Five – SENSATION
-read monsters from the forest on pg. 128 just in case*
- Our senses are the way we experience the world
- Everything we learn is detected by sense organs and transmitted to our brains by
sensory nerves
- Without sensory input – our brains would be useless, would learn nothing, no
thoughts, no experiences
- Sense organs & sensory nerves evolved to provide us with useful information
about external world
oEvolving depends on specific modality of info, characteristics of info and
state of brain when it receives the info
- Differences between sources of info in the environment, have important results
for the way in which sensory systems PROCESS that information
- Example: Difference between the world as we SEE it and HEAR it
oVisual scene received by our eyes changes fast because we move our
body, our head, and our eyes. Kind of like a visual picture frame. It
quickly moves as we shift our eyes around the room.
o However we sense our visual world as STABLE.
oHowever sound is not so variable
oIts intensity changes as we move towards and away from origin, but these
changes are more gradual than the visual system
oAlso, sounds carry around obstacles that visual does not
oAuditory has more time to process signals
- Senses contribute to the richness of our experience
- Audition is extremely important for social behaviour
- Vision provides info about distant events
- Sense of smell tell us about sources of about sources of aromatice molecules
- Taste of foods or touch of a loved ones deal with events occurring immediately
nearby
- Body senses are closely tied to our own movement
Sensory Processing
-Sensation: The detection of the elementary properties of a stimulus
oExample: Brightness, colour, warmth and sweetness
-Perception: detection of the more complex properties of a stimulus, including its
location and nature; involves learning
- Seeing the colour red is sensation, while seeing a red apple is perception
- Seeing a movement is sensation, while seeing a soccer ball coming toward you
and realizing that you will have to move to block it is perception.
- Detecting a sound is not the same as identifying what the source of the sound
means
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Document Summary

Chapter five sensation read monsters from the forest on pg. Our senses are the way we experience the world. Everything we learn is detected by sense organs and transmitted to our brains by sensory nerves. Without sensory input our brains would be useless, would learn nothing, no thoughts, no experiences. Sense organs & sensory nerves evolved to provide us with useful information about external world: evolving depends on specific modality of info, characteristics of info and state of brain when it receives the info. Differences between sources of info in the environment, have important results for the way in which sensory systems process that information. Example: difference between the world as we see it and hear it: visual scene received by our eyes changes fast because we move our body, our head, and our eyes. Senses contribute to the richness of our experience changes are more gradual than the visual system. Audition is extremely important for social behaviour.

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