| ADHD | Attention-deficit/hyperactivity disorder |
| ADHD-I | Predominantly inattentive ADHD |
| ADHD-C | Combined ADHD |
| ADHD-HI | Predominantly hyperactive/impulsive presentation |
| BP | Band power |
| CAST | Childhood Autism Spectrum Test |
| CN | Central |
| CNS | Central nervous system |
| CI | Confidence interval |
| DSM-5 | Diagnostic and Statistical Manual of Mental Disorders, 5th edition |
| EC | Eyes closed |
| EO | Eyes open |
| EOG | Electrooculography |
| EEG | Electroencephalography |
| EMG | Electromyography/electromyographic |
| FDR | False discovery rate |
| FFT | Fast Fourier transform |
| GLMs | General Linear Models |
| ICA | Independent component analysis |
| IQ | Intelligence quotient |
| IAF | Individual alpha frequency |
| IRB | Institutional Review Board |
| K-SADS-E | Kiddie Schedule for Affective Disorders and Schizophrenia—Epidemiologic Version |
| LF | Left frontal |
| LPO | Left parieto-occipital |
| LT | Left temporal |
| PSI | Processing Speed Index |
| QEEG | Quantitative electroencephalography |
| RF | Right frontal |
| ROIs | Regions of interest |
| RPO | Right parieto-occipital |
| RT | Right temporal |
| SD | Standard deviation |
| TD | Typically developing |
| WISC | Wechsler Intelligence Scale for Children |
| WISC-IV | Wechsler Intelligence Scale for Children, Fourth Edition |
| WMI | Working Memory Index |