Table 2. Descriptive statistics of trial numbers and amplitude of the SPN for typically developing (TD) individuals and those with autism spectrum disorder (ASD).

Group	Familiar Faces		Unfamiliar Faces		Familiar Arrows		Unfamiliar Arrows
	Trials	Amplitude	Trials	Amplitude	Trials	Amplitude	Trials	Amplitude
TD	30.15 (2.67)	−6.58 (2.97)	30.21 (2.72)	−3.91 (2.89)	29.92 (3.01)	−.28 (2.97)	30.14 (2.31)	−.12 (2.89)
ASD	25.07 (2.57)	−3.65 (2.89)	30.28 (2.72)	−3.74 (2.89)	28.14 (2.90)	−2.21 (2.89)	25.21 (2.31)	−5.73(2.89)

Means are displayed, followed by standard error in parentheses (SE). Amplitude is the average magnitude of the SPN over the last 200 ms before reward stimulus onset (measured in microvolts).