Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
LETTER Communicated by Sebastian Seung and Miguel Nicolelis Temporal-Code to Rate-Code Conversion by Neuronal
 

Summary: LETTER Communicated by Sebastian Seung and Miguel Nicolelis
Temporal-Code to Rate-Code Conversion by Neuronal
Phase-Locked Loops
Ehud Ahissar
Department of Neurobiology, Weizmann Institute of Science, Rehovot 76100, Israel
Peripheral sensory activity follows the temporal structure of input sig-
nals. Central sensory processing uses also rate coding, and motor outputs
appear to be primarily encoded by rate. I propose here a simple, efficient
structure, converting temporal coding to rate coding by neuronal phase-
locked loops (PLL). The simplest form of a PLL includes a phase detector
(that is, a neuronal-plausible version of an ideal coincidence detector) and
a controllable local oscillator that are connected in a negative feedback
loop. The phase detector compares the firing times of the local oscillator
and the input and provides an output whose firing rate is monotonically
related to the time difference. The output rate is fed back to the local oscil-
lator and forces it to phase-lock to the input. Every temporal interval at the
input is associated with a specific pair of output rate and time difference
values; the higher the output rate, the further the local oscillator is driven
from its intrinsic frequency. Sequences of input intervals, which by def-
inition encode input information, are thus represented by sequences of

  

Source: Ahissar, Ehud - Department of Neurobiology, Weizmann Institute of Science

 

Collections: Biology and Medicine