Sensory Coding: Converting Stimuli to Sensations
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Questions and Answers

What is the primary function of sensory coding?

  • Converting a receptor stimulus to a recognizable sensation (correct)
  • Regulating the intensity of sensory stimuli
  • Processing sensory information in the spinal cord
  • Transmitting energy signals to the brain
  • What is the term for the type of energy transmitted by a stimulus?

  • Intensity
  • Location
  • Modality (correct)
  • Duration
  • Which of the following is an example of an adequate stimulus?

  • Pressure on the eyeball
  • Light on the rods and cones in the eyes (correct)
  • Light on the skin
  • Sound on the eardrum
  • What is the term for the spatial distribution from which a stimulus produces a response in a sensory unit?

    <p>Receptive field</p> Signup and view all the answers

    What is the characteristic of the representation of senses in the skin?

    <p>Punctate</p> Signup and view all the answers

    What is the term for a single sensory axon and all its peripheral branches?

    <p>Sensory unit</p> Signup and view all the answers

    What is the response of sensory receptors to forms of energy other than their adequate stimuli?

    <p>Higher threshold</p> Signup and view all the answers

    What is the characteristic of the threshold of sensory receptors to their adequate stimuli?

    <p>Lower than normal</p> Signup and view all the answers

    What is the primary function of lateral inhibition in sensory perception?

    <p>To enhance the contrast between the center and periphery of a stimulated area</p> Signup and view all the answers

    What determines the intensity of sensation in mechanoreceptors?

    <p>The amplitude of the stimulus applied to the receptor</p> Signup and view all the answers

    What is the effect of increasing the stimulus strength on the receptors?

    <p>More receptors are activated and the impulse frequency increases</p> Signup and view all the answers

    What happens to the receptor potential in a mechanoreceptor as a greater pressure is applied to the skin?

    <p>It increases in magnitude</p> Signup and view all the answers

    What is the role of receptors with the lowest thresholds in sensory perception?

    <p>They are the first to be activated by weak stimuli</p> Signup and view all the answers

    What is the result of the overlap and interdigitation of sensory units?

    <p>More sensory fibers fire in response to the stimulus</p> Signup and view all the answers

    What is the underlying mechanism of two-point discrimination?

    <p>Lateral inhibition</p> Signup and view all the answers

    What is the relationship between the amplitude of the stimulus and the frequency of action potentials in a single axon?

    <p>The frequency of action potentials increases as the amplitude of the stimulus increases</p> Signup and view all the answers

    What is the result of increasing the number of afferent pathways activated?

    <p>An increase in intensity of sensation</p> Signup and view all the answers

    What happens to the frequency of action potentials in a sensory nerve when a constant strength stimulus is maintained?

    <p>It declines over time</p> Signup and view all the answers

    What is the term for the decline in frequency of action potentials in a sensory nerve over time?

    <p>Receptor adaptation</p> Signup and view all the answers

    How can receptors be classified based on their adaptation?

    <p>As phasic or tonic receptors</p> Signup and view all the answers

    Which of the following receptors are examples of rapidly adapting receptors?

    <p>Meissner and Pacinian corpuscles</p> Signup and view all the answers

    What is the significance of receptor adaptation for an individual?

    <p>It has some value to the individual</p> Signup and view all the answers

    What type of receptors are muscle spindles and nociceptors?

    <p>Slowly adapting receptors</p> Signup and view all the answers

    What would happen if input from nociceptors adapted rapidly?

    <p>The warning provided by pain would be lost</p> Signup and view all the answers

    What is an advantage of receptor adaptation for maintaining posture?

    <p>It is necessary for maintaining posture</p> Signup and view all the answers

    Why is it beneficial that light touch does not persist?

    <p>It is distracting if persistent</p> Signup and view all the answers

    What is the significance of the rate of adaptation for an individual?

    <p>It has some value to the individual</p> Signup and view all the answers

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