Flicker

Inhibitory

aei $a_{ei}$

aii $a_{ii}$

τi $\tau_i$

θi $\theta_i$

gi $g_i$

σi $\sigma_i$

Excitatory

aee $a_{ee}$

aie $a_{ie}$

τe $\tau_e$

θe $\theta_e$

ge $g_e$

σe $\sigma_e$

Stimulus & time stepping

Δt $\Delta t$

A $A$

T $T$

Flicker Presets

Just for fun presets

Simulation

Flicker Phosphene Model

This is an implementation of the flicker-phosphene hallucination model in Javascript.

Three parameter settings that display flicker-induced pattern formation are available as presets. Some other parameters that lead to spontaneous (not flicker-induced) pattern formation are also available, just for fun.

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The E-cell firing rate is represented as yellow and the I-cell firing rate as blue.

©2015 Michael Rule all rights reserved

S (t) = A \cdot Heav (sin (2 π t / T) - 0.8)

$S(t) = A \cdot \operatorname{Heav}(\sin(2 \pi t / T) - 0.8)$

τ e U e ˙ = - U e + f (a e e \cdot K e ⋆ U e - a i e \cdot K i ⋆ U i - θ e + g e S (t))

$\tau_e \dot{U_e} = -U_e + f( a_{ee} \cdot K_e \star U_e - a_{ie} \cdot K_i \star U_i - \theta_e + g_e S(t) )$

τ i U i ˙ = - U i + f (a e i \cdot K e ⋆ U e - a i i \cdot K i ⋆ U i - θ i + g i S (t))

$\tau_i \dot{U_i} = -U_i + f( a_{ei} \cdot K_e \star U_e - a_{ii} \cdot K_i \star U_i - \theta_i + g_i S(t) )$

K e, i (x) = 1 σ e , i 2 π - - \sqrt e ∣ x ∣ 2 / 2 σ 2 e, i

$K_{e,i}(x)=\frac{1}{\sigma_{e,i} \sqrt{2\pi}}e^{\mid x \mid^2 / 2\sigma_{e,i}^2}$