Table 2.

Selected Studies Related to Spectral Power for an Overview of Relevant Advances in the Field

Paper	Number of Subjects (Those with ASD)	Control	Condition	Measure	Changes in ASD
Sheikhani et al26	N=15	N=26 females and 29 males	Relaxed and eyes opened	Spectral properties	Alpha frequency power ratio was found to be reduced
Van Diessen et al27	N=Unspecified	N/A	Speech and Sound	Spectral power	Gamma power was found to be increased in frontal and temporal regions.
Stroganova et al28	N=40	N=40 males	Sustained visual issues	Spectral power	Issues of electrode location from myogenic artefacts
Yang et al25	N=5	N=7 with age-matched	Analysing known photographs	Spectral power	Decrease in the frequency range
Elhabashy et al30	N=21	N=21 with an age range of 4–12 years	Relaxed eyes movement	Absolute and relative spectral	Delta and that power was found to be increased in the frontal region
Lushchekina et al29	N=27	N=19 males and 8 females	Relaxed eyes movement and counting numbers	Alpha, beta, and gamma spectral power	Increase in spectral power and ASD gamma spectral power