Abstract:
:The information transmission properties of single, de-efferented primary muscle-spindle afferents from the hind limb of the cat were investigated. The gastrocnemius medialis muscle was stretched randomly while recording spike trains from several muscle-spindle afferents in the dorsal root. Two classes of input stimuli were used: (i) Gaussian noise with band-limited flat spectrum, and (ii) Gaussian noise with a more "naturalistic" 1/f(n) spectrum. The "reconstruction" method was used to calculate a lower bound to the information rate (in bits per second) between the muscle spindles and the spinal cord. Results show that in response to the flat-spectrum input, primary muscle-spindle afferents transfer information mainly about high frequencies, carrying 2.12 bits/spike. In response to naturalistic-spectrum inputs, primary muscle-spindle afferents transfer information about both low and high frequencies, with "spiking efficiency" increasing to 2.67 bits/spike. A simple muscle-spindle simulation model was analyzed with the same method, emphasizing the important part played by the intrafusal fiber mechanical properties in information transmission.
journal_name
Biol Cybernjournal_title
Biological cyberneticsauthors
Tock Y,Ljubisavljevic M,Thunberg J,Windhorst U,Inbar GF,Johansson Hdoi
10.1007/s00422-002-0341-2keywords:
subject
Has Abstractpub_date
2002-10-01 00:00:00pages
241-8issue
4eissn
0340-1200issn
1432-0770journal_volume
87pub_type
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