Table 4. Mean power spectral density for each group for each frequency range at each age collapsed across hemisphere.

	Low Risk Control	High Risk Autism
Delta
6	7.60 (0.41)	7.33 (0.47)
9	7.76 (0.43)	7.49 (0.36)
12	7.57 (0.39)	7.43 (0.44)
18	7.63 (0.34)	5.58 (0.36)
24	7.59 (0.32)	7.45 (0.33)
Theta
6	6.69 (0.49)	6.47 (0.50)
9	6.93 (0.45)	6.61 (0.35)
12	6.97 (0.40)	6.72 (0.51)
18	6.93 (0.42)	6.88 (0.50)
24	7.02 (0.54)	6.65 (0.38)
Low Alpha
6	5.74 (0.47)	5.53 (0.46)
9	6.02 (0.42)	5.80 (0.40)
12	6.39 (0.46)	6.06 (0.50)
18	6.25 (0.44)	6.21 (0.47)
24	6.33 (0.35)	6.08 (0.43)
High Alpha
6	4.81 (0.49)	4.54 (0.44)
9	4.94 (0.43)	4.74 (0.36)
12	4.96 (0.42)	4.83 (0.42)
18	5.06 (0.42)	4.92 (0.31)
24	5.18 (0.27)	5.03 (0.38)
Beta
6	4.16 (0.51)	3.81 (0.41)
9	4.29 (0.49)	4.09 (0.42)
12	4.28 (0.42)	4.07 (0.54)
18	4.17 (0.40)	4.14 (0.42)
24	4.71 (0.39)	4.13 (0.41)
Gamma
6	3.31 (0.59)	2.97 (0.44)
9	3.45 (0.54)	3.22 (0.48)
12	3.38 (0.52)	3.13 (0.59)
18	3.14 (0.39)	3.13 (0.59)
24	3.23 (0.50)	3.03 (0.49)

Values presented in natural log of power spectral density. Standard deviation in parentheses.