47 lines
2.5 KiB
Plaintext
47 lines
2.5 KiB
Plaintext
## Cortical domain activity is state dependent ##
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* Previously demonstrated that general anesthesia abolishes spontaneous activity in visual system (Ackman Nature 2012).
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* What about ongoing activity in other cortical areas during early brain development? Surgical procedure relevance.
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* No population calcium activity found during gen'l anesthesia, only slow traveling waves.
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* During anesthesia induction, rapid (<30 s) knock down of discrete domain activity (P3 mouse <120518_09.tif>). Cingulate, retrosplenial activations the last to go-- default mode/resting state network areas last.
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<120518_09_mjpeg.mov>
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### Cortical activity and motor activity is periodic
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Even more zoomed in.
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Conclusions: The two hemispheres seem to be mostly synchronized, though it’s possible the R hemispshere (which is also the slightly more ‘active’ hemisphere, see stats table below) leads the left by a bit. The asymmetric peak at –150–175frames is interesting. That would be about 30–35 sec.
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The big secondary peaks around ±30 sec is present in both autocorrs and xcorrs and is far above the random normal xcorr baseline (blue trace). In fact there is a periodicity seen in the autocorrs and the xcorrs where there is a dampening oscillation about on this interval! (See ideal dampening frequency in random sine wave example above). This corresponds to a 1/30sec == 0.033 Hz ultra-slow oscillation.
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Looking at the above plot showing lags from [–1000, 1000] frames which is ± 200 s, we can see about 5.5 cycles of this underlying dampening oscillation in both autocorr plots. This corresponds to (1000fr*0.2sec/fr)/5.5 => 36.36 sec/cycle => 0.0275 cycles/sec or ~0.03 Hz
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### Cortical activity is correlated with the motor signal
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### Percentage of cortical activity which exhibits corr with motor signal?
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lenActvFraction>0 | fracCorr | timeCorr_s | fracCorrPos | timeCorrPos_s | fracCorrNeg | timeCorrNeg_s
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--- | --- | --- | --- | --- | --- | ---
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2161 | 0.30032 | 129.8 | 0.27441 | 118.6 | 0.025914 | 11.2
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### Cross-correlation of cortical activity and motor activity
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xcorr for whole.
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xcorr during motor period.
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