Done bullet-pointing and formalizing TLP invariance

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j-hartling
2025-11-14 16:22:30 +01:00
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@@ -309,26 +309,32 @@ $c_i(t)$ exceeds the threshold value $\thr$ during the corresponding averaging
interval $\tlp$
\textbf{Implication for intensity invariance:}\\
- Convolution output $c_i(t)$ = amplitude-based quantity\\
$\rightarrow$ Values indicate correspondence between template waveform and signal\\
- Convolution output $c_i(t)$ quantifies temporal similarity between amplitudes of
template waveform $k_i(t)$ and signal $\adapt(t)$ centered at time point $t$\\
$\rightarrow$ Based on amplitudes on a graded scale
$\rightarrow$ Values indicate correspondence between a template waveform $k_i(t)$
matches
the waveform of the pre-processed signal $\adapt(t)$ at a given time point $t$
- Feature $\feat(t)$ quantifies the probability that amplitudes of $c_i(t)$
exceed threshold value $\thr$ within interval $\tlp$ around time point $t$\\
$\rightarrow$ Based on binned amplitudes corresponding to one of two categorical states
$\rightarrow$ Deliberate loss of precise amplitude information\\
$\rightarrow$ Emphasis on temporal structure (ratio of $T_1$ over $\tlp$)
- Feature $\feat(t)$ = duty cycle-based quantity\\
$\rightarrow$ Values indicate the ratio of two temporal quantities\\
$\rightarrow$ Values indicate the ratio of time, or probability, that $c_i(t)$
exceeds threshold value $\thr$ within
- Thresholding of $c_i(t)$ and subsequent temporal averaging of $\bi(t)$ to
obtain $\feat(t)$ constitutes a remapping of an amplitude-encoding quantity into a
duty cycle-encoding quantity, mediated by threshold function $\nl$
- Different scales of $c_i(t)$ can result in similar $T_1$ segments depending
on the magnitude of the derivative of $c_i(t)$ in temporal proximity to time
points at which $c_i(t)$ crosses threshold value $\thr$\\
$\rightarrow$ The steeper the slope of $c_i(t)$, the less $T_1$ changes with scale variations\\
$\rightarrow$ Extreme amplitudes of $c_i(t)$ (peaks/troughs)
$\rightarrow$ Only amplitudes of \\
$\rightarrow$ Absolute amplitudes of peaks/troughs of $c_i(t)$ \\
$\rightarrow$ Acuity of peaks/troughs in $c_i(t)$ matters, not their absolute amplitude
- From graded stimulus to categorical behavioral decision:\\
- Feature $\feat(t)$ = duty cycle-based quantity\\
$\rightarrow$ Values indicate how often $c_i(t)$ exceeds threshold value $\thr$
- Thresholding of $c_i(t)$ and subsequent temporal averaging of $\bi(t)$ to obtain $\feat(t)$
constitutes a remapping of an amplitude-based quantity (values indicating the match between) into a duty cycle-based quantity\\
\section{Discriminating species-specific song\\patterns in feature space}