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Title:

Sensory system tuning filtering and organization

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Range is thus 'tuned' based on the specificity of the ecological demands ... Katydid killer auditory tuning. Parasitoid fly auditory tuning ... – PowerPoint PPT presentation

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Title: Sensory system tuning filtering and organization


1
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
2
Optimum sensitivity does not necessarily mean
most meaningful
Vision
Olfaction
3
Moth olfactory tuning Concentration response
function (receptor neurons) for different odors
4
Moth olfactory tuning concentration response
function (output)
5
Moth olfactory tuning Concentration response
function (behavioral)
6
Increased sensitivity usually means increased
neural representation in sensory array
Vision
7
Increased sensitivity usually means increased
neural representation in sensory array
Olfaction
8
Increased sensitivity usually means increased
neural representation centrally
Moth olfactory tuning
Male antennal lobe
Female antennal lobe
9
Increased sensitivity usually means increased
neural representation centrally Relative volume
of somatosensory cortex devoted to area of skin
10
Central organization
Somatotopic integrity maintains an organized
representation
11
Retinotopic integrity of sensory input at the
level of primary visual cortex
12
Chemotopic integrity maintains an organized
representation of receptor type
13
Chemotopic integrity maintains an organized
representation of receptor type
14
Types of sensory systems found in nature
  • Chemical senses
  • Olfaction
  • Taste
  • Vision
  • Auditory
  • Vestibular
  • Somatosensory
  • Proprioception
  • Nociception
  • Mechanosensation
  • Thermosensation
  • Magnosensation
  • Electromagnosensation
  • Geomagnosensation
  • Geosensation
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