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\expandafter\ifx\csname doTocEntry\endcsname\relax \expandafter\endinput\fi | ||
\par |
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\expandafter\ifx\csname doTocEntry\endcsname\relax \expandafter\endinput\fi |
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/* start css.sty */ | ||
.cmr-10x-x-109{} | ||
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.cmmi-8{font-size:72%;font-style: italic;} | ||
.cmsy-10x-x-109{} | ||
p.noindent { text-indent: 0em } | ||
td p.noindent { text-indent: 0em; margin-top:0em; } | ||
p.nopar { text-indent: 0em; } | ||
p.indent{ text-indent: 1.5em } | ||
@media print {div.crosslinks {visibility:hidden;}} | ||
a img { border-top: 0; border-left: 0; border-right: 0; } | ||
center { margin-top:1em; margin-bottom:1em; } | ||
td center { margin-top:0em; margin-bottom:0em; } | ||
.Canvas { position:relative; } | ||
img.math{vertical-align:middle;} | ||
li p.indent { text-indent: 0em } | ||
li p:first-child{ margin-top:0em; } | ||
li p:last-child, li div:last-child { margin-bottom:0.5em; } | ||
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/* end css.sty */ | ||
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reports/report3/formulae/action_selection_formulae.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" | ||
"http://www.w3.org/TR/html4/loose.dtd"> | ||
<html > | ||
<head><title></title> | ||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> | ||
<meta name="generator" content="TeX4ht (http://www.tug.org/tex4ht/)"> | ||
<meta name="originator" content="TeX4ht (http://www.tug.org/tex4ht/)"> | ||
<!-- html --> | ||
<meta name="src" content="action_selection_formulae.tex"> | ||
<meta name="date" content="2015-05-18 14:22:00"> | ||
<link rel="stylesheet" type="text/css" href="action_selection_formulae.css"> | ||
</head><body | ||
> | ||
<!--l. 34--><p class="noindent" >Integrate-and-fire neurons: | ||
<center class="math-display" > | ||
<img | ||
src="action_selection_formulae0x.png" alt="dv- ge(Ee---vr)+-El---v | ||
dt = τm | ||
" class="math-display" ></center> | ||
<center class="math-display" > | ||
<img | ||
src="action_selection_formulae1x.png" alt="dge ge | ||
--- = - -- | ||
dt τe " class="math-display" ></center> where | ||
<span | ||
class="cmmi-10x-x-109">v </span>is the membrane potential, <span | ||
class="cmmi-10x-x-109">g</span><sub><span | ||
class="cmmi-8">e</span></sub> is the synaptic conductance, <span | ||
class="cmmi-10x-x-109">E</span><sub><span | ||
class="cmmi-8">e</span></sub> and <span | ||
class="cmmi-10x-x-109">E</span><sub><span | ||
class="cmmi-8">l</span></sub> are reverse potentials, <span | ||
class="cmmi-10x-x-109">v</span><sub><span | ||
class="cmmi-8">r</span></sub> is the | ||
resting potential and <span | ||
class="cmmi-10x-x-109">τ</span><sub><span | ||
class="cmmi-8">m</span></sub> is a time constant. <br | ||
class="newline" /><br | ||
class="newline" />Reward-modulated synapses with STDP: | ||
<center class="math-display" > | ||
<img | ||
src="action_selection_formulae2x.png" alt="dw- = c⋅Dop | ||
dt | ||
" class="math-display" ></center> | ||
<center class="math-display" > | ||
<img | ||
src="action_selection_formulae3x.png" alt="dDop- = - Dop- | ||
dt τDop | ||
" class="math-display" ></center> | ||
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<center class="math-display" > | ||
<img | ||
src="action_selection_formulae4x.png" alt="dc c | ||
dt = -τ- | ||
c | ||
" class="math-display" ></center> | ||
<center class="math-display" > | ||
<img | ||
src="action_selection_formulae5x.png" alt="dApre- = - Apre- | ||
dt τpre | ||
" class="math-display" ></center> | ||
<center class="math-display" > | ||
<img | ||
src="action_selection_formulae6x.png" alt="dApost- Apost- | ||
dt = - τpost " class="math-display" ></center> where | ||
<span | ||
class="cmmi-10x-x-109">w </span>is the weight of the synapse, <span | ||
class="cmmi-10x-x-109">c </span>is the eligibility trace, <span | ||
class="cmmi-10x-x-109">Dop </span>is the level of dopamine, <span | ||
class="cmmi-10x-x-109">dApre </span>and <span | ||
class="cmmi-10x-x-109">dApost </span>are | ||
variables that govern the STDP, and the <span | ||
class="cmmi-10x-x-109">τ</span>s are time constants. When the pre-synaptic neuron fires, the | ||
following updates are executed: | ||
<center class="math-display" > | ||
<img | ||
src="action_selection_formulae7x.png" alt="ge = ge + w | ||
" class="math-display" ></center> | ||
<center class="math-display" > | ||
<img | ||
src="action_selection_formulae8x.png" alt="Apre = Apre + Aprestep | ||
" class="math-display" ></center> | ||
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<center class="math-display" > | ||
<img | ||
src="action_selection_formulae9x.png" alt="c = c + Apost " class="math-display" ></center> | ||
When the post-synaptic neuron fires, the following updates are executed, where <span | ||
class="cmmi-10x-x-109">Apre</span><sub><span | ||
class="cmmi-8">step</span></sub> and <span | ||
class="cmmi-10x-x-109">Apost</span><sub><span | ||
class="cmmi-8">step</span></sub> are | ||
constants. | ||
<center class="math-display" > | ||
<img | ||
src="action_selection_formulae10x.png" alt="Apost = Apost + Apoststep | ||
" class="math-display" ></center> | ||
<center class="math-display" > | ||
<img | ||
src="action_selection_formulae11x.png" alt="c = c+ Apre | ||
" class="math-display" ></center> | ||
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</body></html> | ||
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