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Coda to sensory transduction:
We presented and discussed 5 major categories of sensory systems that are relevant to
vertebrate and in many cases invertebrate systems:
1. Auditory
2. Somatosensory (e.g. mechano thermo and proprio)
3. Chemical (taste and smell)
4. Vision
5. Vestibular
Coda to sensory transduction:
Keep in mind that there are other types of sensory systems
1. Infrared (pit organs of snakes and insects)
2. Electromagnetic (several fresh and saltwater fishes)
3. Magneto (bacteria and fishes)
European Jewel Beetle
http://www.zoologie.uni-bonn.de/Neurophysiologie/home/Schmitz/IndexD.htm
Coda to sensory transduction:
There are many other variations of these and other systems
• Whisker barrels in rodents (mechano)
• Polarized light (vision: e.g. insects, fishes, turtles)
• Mechano and chemo sensors on arthropods
Coda to sensory transduction:
Type I vs Type II receptors
• Type I are adapted neural endings
• Type II are complex containing both non-neural receptors and an associated neuron/s
• Olfactory receptor neurons are classified as Type II but they don’t really fit that
model, they are spiking cells and they transmit to the CNS
Coda to sensory transduction:
Modification of sensory responses
• Processing effects:
• Presynaptic depression
• Presynaptic facilitation
• Adaptation
Tuning
• Filtering
• Compression
• Integration
• Spatial
• Temporal