bsc2010chap49

bsc2010chap49 - 1. The brain's processing of sensory input...

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The way it ISN’T: sensing brain analysis action. The way it is: sensing, analysis, and action are ongoing and overlapping processes. Sensations begin as different forms of energy that are detected by sensory receptors. This energy is converted to action potentials that travel to appropriate regions of the brain. The limbic region plays a major role in determining the importance of a particular sensory input. 1. The brain’s processing of sensory input and motor output is cyclical rather than linear
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Sensations are action potentials that reach the brain via sensory neurons. Perception is the awareness and interpretation of the sensation.
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1. Sensory receptors transduce stimulus energy and transmit signals to the nervous system
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Sensory reception begins with the detection of stimulus energy by sensory receptors. Exteroreceptors detect stimuli originating outside the body. Interoreceptors detect stimuli originating inside the body. Sensory receptors convey the energy of stimuli into membrane potentials and transmit the signals to the nervous system. This involves: sensory transduction, amplification, transmission, and integration.
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Sensory Transduction. The conversion of stimulus energy into a change in membrane potential. Receptor potential : a sensory receptor’s version of a graded potential.
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Amplification. The strengthening of stimulus energy that can be detected by the nervous system.
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Transmission. The conduction of sensory impulses to the CNS. Some sensory receptors must transmit chemical signals to sensory neurons. The strength of the stimulus and receptor potential affects the amount of neurotransmitter released by the sensory receptor. Some sensory receptors are sensory neurons. The intensity of the receptor potential affects the frequency of action potentials.
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Integration. The processing of sensory information. Begins at the sensory receptor. For example, sensory adaptation is a decrease in responsiveness to continued stimulation.
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2. Sensory receptors are categorized by the type of energy they transduce
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Mechanoreceptors respond to mechanical energy. e.g. muscle spindles,
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This note was uploaded on 04/07/2008 for the course BIO bsc2010 taught by Professor Trombley during the Spring '08 term at FSU.

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bsc2010chap49 - 1. The brain's processing of sensory input...

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