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Sensing and Responding to the Environment
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CB 48.3
Nerves allow us to perceive the environment while the brain integrates the incoming signals to determine an appropriate response.
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CB 48.4Neurons: cells specialized fortransmitting signals
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CB 48.14
Neurons are commonly connected to many other neurons, and the effect of the different incoming signals determines what the neuron will do.
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The brain and the central nervous system integrate the various incoming signals
CB 49.4
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Different regions of the cerebral cortex integrate different inputs/outputs
CB 49.15
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CB 49.17
Visualizing the specialization of brain regions
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Some body parts have more sensory input/motor control
CB 49.16
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CB 48.3
Some responses are to subtle stimuli
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Circadian Rhythms: daily patterns set by light(northern flying squirrel)
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Today’s video about different human reactions to cool:http://www.youtube.com/watch?v=XHmM7gJhscU
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"The Role of Dreams in the Evolution of the Human Mind" by Michael Franklin and Michael Zyphur in Evolutionary Psychology 2005. 3: 59-78
http://human-nature.com/ep/articles/ep035978.html
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Why do we dream?
Random Neural Activity or Rehearsal
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Why do we dream?
Dreams are difficult to study because of their
subjectivity
Some are rational while others are
non-sensical
Is there an evolutionary explanation?
Were/are individuals that dream better at
passing on genes?
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Why do we dream?
Is there an evolutionary explanation?
Most common in REM
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Why do we dream?
Rehearsal, conscious practice activates and
exercises connections.
What about unconscious practice?
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Why do we dream?
Common dream subjects are threats and social
interactions.
There is some randomness – randomness gives
broad variability of dreams and generates new
situations
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Why do we dream?
Dreams as rehearsal for threats, social
situations, etc.
Practice, conscious and unconscious, can
improve performance, so might give
evolutionary advantage.
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Fig 46.1
Nerves allow us to perceive the environment while the brain integrates the incoming signals to determine an appropriate response.
Response
Responses can be release of hormones, change in cell activity, or muscle contraction
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Sensing and Responding to the Environment