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wholeBrain_results-state_dependence.txt

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+## Cortical domain activity is state dependent  ##
+
+* Previously demonstrated that general anesthesia abolishes spontaneous activity in visual system (Ackman Nature 2012). 
+* What about ongoing activity in other cortical areas during early brain development? Surgical procedure relevance.
+* No population calcium activity found during gen'l anesthesia, only slow traveling waves.
+* 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.
+<120518_09_mjpeg.mov>
+
+
+
+### Cortical activity and motor activity is periodic
+
+![](../figures/Screen_Shot_2013-04-08_at_2.31.33_PM.png)
+
+Even more zoomed in. 
+![](../figures/Screen_Shot_2013-04-08_at_2.34.50_PM.png)
+
+
+![](../figures/Screen_Shot_2013-05-02_at_10.53.40_AM.png)
+
+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.
+
+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.
+
+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
+
+
+
+### Cortical activity is correlated with the motor signal
+
+![](../figures/Screen_Shot_2013-04-25_at_5.18.36_PM.png)
+
+![](../figures/Screen_Shot_2013-04-25_at_3.59.05_PM.png)
+
+### Percentage of cortical activity which exhibits corr with motor signal?
+
+lenActvFraction>0 | fracCorr | timeCorr_s | fracCorrPos | timeCorrPos_s | fracCorrNeg | timeCorrNeg_s
+ --- | --- | --- | --- | --- | --- | ---
+2161 | 0.30032 | 129.8 | 0.27441 | 118.6 | 0.025914 | 11.2
+
+
+### Cross-correlation of cortical activity and motor activity
+xcorr for whole. 
+![](../figures/Screen_Shot_2013-04-24_at_2.39.50_PM.png)
+
+xcorr during motor period. 
+![](../figures/Screen_Shot_2013-04-24_at_3.11.10_PM.png)