Table 2. Regression results for neuron excitement.

Region 20 is the most recent region, and region 2 is the oldest region. Dummy variables are used to isolate the effect of neuron excitement for each region. Region 1 is removed to avoid the dummy variable trap. The largest coefficient is region 19 (x18), the second most recent region, with a value of 0.055.

Dep. Variable:		y		R-squared:		0.004
Model:		OLS		Adj. R-squared:		0.004
Method:		Least Squares		F-statistic:		15.75
No. Observations:		70680		Prob (F-statistic):		1.56E-49
Df Residuals:		70661		Log-Likelihood:		1.11E+05
Df Model:		18		AIC:		-2.22E+05
Covariance Type:		nonrobust		BIC:		-2.22E+05
	coef	std err.	t	P>|t|	[0.025	0.975]
x1	0.044	0.001	53.288	0	0.042	0.046
x2	0.0465	0.001	56.223	0	0.045	0.048
x3	0.0479	0.001	57.962	0	0.046	0.05
x4	0.0465	0.001	56.305	0	0.045	0.048
x5	0.0472	0.001	57.048	0	0.046	0.049
x6	0.0479	0.001	57.977	0	0.046	0.05
x7	0.0479	0.001	57.919	0	0.046	0.049
x8	0.0491	0.001	59.375	0	0.047	0.051
x9	0.0495	0.001	59.882	0	0.048	0.051
x10	0.049	0.001	59.286	0	0.047	0.051
x11	0.0527	0.001	63.763	0	0.051	0.054
x12	0.0532	0.001	64.408	0	0.052	0.055
x13	0.0523	0.001	63.326	0	0.051	0.054
x14	0.0532	0.001	64.412	0	0.052	0.055
x15	0.0541	0.001	65.486	0	0.053	0.056
x16	0.0533	0.001	64.466	0	0.052	0.055
x17	0.0547	0.001	66.155	0	0.053	0.056
x18	0.055	0.001	66.592	0	0.053	0.057
x19	0.0518	0.001	62.682	0	0.05	0.053