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comment Sensitivity of human eye to luminance
No. decibels are indeed logarithmic, but note that the x-axis is "linear" in decibels, and the y-axis is logarithmic. So the relation between subjective estimate and luminance is linear in a log-log plot, i.e., a power-law.
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comment Significant baseline, Oddball paradigm
a bandpass filter can be implemented as causal or non-causal ( en.wikipedia.org/wiki/Causal_filter ). a non-causal 0.5 to 20 Hz bandpass can cause what you are describing. I'll try to look for some references later.