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Sensory system tuning (filtering) and organization. All sensory systems are designed to extract information from the environment Sensory systems are usually selective Systems tend to focus on a range of what is available Range tends to be restricted to what is “biologically meaningful”

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slide1

Sensory system tuning (filtering) and organization

  • All sensory systems are designed to extract information from the environment
  • Sensory systems are usually selective
    • Systems tend to focus on a range of what is available
    • Range tends to be restricted to what is “biologically meaningful”
    • Range is thus “tuned” based on the specificity of the ecological demands
      • Tuning tends to have an “optimum” or “best” stimulus
      • Deviation from this “best” yields less than optimal sensitivity
  • Keep track of the origin of the tuning curve: it is behavioral or neural data.

Katydid killer auditory tuning

Parasitoid fly auditory tuning

slide3

Moth olfactory tuning:

Concentration response function (receptor neurons) for different odors

slide5

Moth olfactory tuning:

Concentration response function (behavioral)

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Increased sensitivity usually means increased neural representation in sensory array

Vision

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Increased sensitivity usually means increased neural representation in sensory array

Olfaction

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Increased sensitivity usually means increased neural representation centrally

Moth olfactory tuning

Male antennal lobe

Female antennal lobe

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Increased sensitivity usually means increased neural representation centrally

Relative volume of somatosensory cortex devoted to area of skin

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Central organization

Somatotopic integrity: maintains an organized representation

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Types of sensory systems found in nature

  • Chemical senses
    • Olfaction
    • Taste
  • Vision
  • Auditory
  • Vestibular
  • Somatosensory
    • Proprioception
    • Nociception
    • Mechanosensation
    • Thermosensation
  • Magnosensation
    • Electromagnosensation
    • Geomagnosensation
  • Geosensation