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Sensory system tuning (filtering) and organization

Date post: 30-Dec-2015
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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” - PowerPoint PPT Presentation
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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” •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
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Page 1: Sensory system tuning (filtering) and organization

Sensory system tuning (filtering) and organization

All sensory systems are designed to extract information from the environmentSensory 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 tuningParasitoid fly auditory tuning

Page 2: Sensory system tuning (filtering) and organization

Optimum sensitivity does not necessarily mean “most meaningful”

VisionOlfaction

Page 3: Sensory system tuning (filtering) and organization

Moth olfactory tuning:Concentration response function (receptor neurons) for different odors

Page 4: Sensory system tuning (filtering) and organization

Moth olfactory tuning concentration response function (output)

Page 5: Sensory system tuning (filtering) and organization

Detection threshold

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concentration

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Moth olfactory tuning:Concentration response function (behavioral)

Page 6: Sensory system tuning (filtering) and organization

Increased sensitivity usually means increased neural representation in sensory array

Vision

Page 7: Sensory system tuning (filtering) and organization

Olfaction

Increased sensitivity usually means increased neural representation in sensory array

Page 8: Sensory system tuning (filtering) and organization

Moth olfactory tuningIncreased sensitivity usually means increased neural representation centrally

Male antennal lobe Female antennal lobe

Page 9: Sensory system tuning (filtering) and organization

Increased sensitivity usually means increased neural representation centrallyRelative volume of somatosensory cortex devoted to area of skin

Page 10: Sensory system tuning (filtering) and organization

Somatotopic integrity: maintains an organized representation

Central organization

Page 11: Sensory system tuning (filtering) and organization

Retinotopic integrity of sensory input at the level of primary visual cortex

Page 12: Sensory system tuning (filtering) and organization

Chemotopic integrity: maintains an organized representation of receptor type

Page 13: Sensory system tuning (filtering) and organization

Chemotopic integrity: maintains an organized representation of receptor type

Page 14: Sensory system tuning (filtering) and organization

Types of sensory systems found in nature

1. Chemical senses• Olfaction• Taste

2. Vision 3. Auditory4. Vestibular 5. Somatosensory

• Proprioception• Nociception• Mechanosensation• Thermosensation

6. Magnosensation • Electromagnosensation• Geomagnosensation

7. Geosensation


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