On the other hand, in case of TD, the filter settings remained identical, while the type of click-train changed from the standard sound stimulus (standards and TD: TS30_Low and TS60_Low, TS30_High and TS60_High, TS60_Low and TS30_Low, TS60_High and TS30_High).
32– 36 The arithmetic average locked to the epoch −100 to +800 milliseconds with respect to the presentation of each stimulus (standards, deviants, and novels) was computed to yield the respective ERP responses.
The resulting time courses were downsampled for each scan to the regressors of interest (novel and familiar target stimuli, standard picture) included in a General Linear Model (GLM).
Covariates were modeled for the conditions of interest (novel and familiar target stimuli, standard picture), the six rigid-body movement parameters determined from realignment, and a single constant representing the mean over scans.
Two types of stimuli (standard and test) were presented randomly on the left and right sides of the screen.
Trains of four identical stimuli (standard trials) and trains of three identical stimuli followed by a stimulus from a different phonetic category (deviant trials) were presented.
It is defined by a negative deflection during the time range of approximately 100 250 ms after stimulus onset, and this response is elicited by infrequent stimuli (deviant) compared to repeated stimuli (standard) [ 16].
In the next time window, ANOVA showed the significance of orientation (F[1,12] = 5.6; p < 0.04), with a greater N3 to rotated than to standard stimuli (standard = -0.303; rotated = -0.400 μV).
The ANOVA performed on the percentages of omitted responses (arcsine transformed) showed the significance of the orientation factor (F[1,12] = 172.17; p < 0.0001), revealing a greater percentage of omissions to rotated than to standard stimuli (standard = 6.52%; rotated = 15.25%).
In this paradigm, two stimuli (a standard stimulus that has a constant saturation/contrast level and a test stimulus that varies in the level of color saturation/contrast sensitivity) are preceded by a cue that appears adjacent to the test, neutral, or standard stimulus location.
The subjects were presented with random dot patterns created using the face stimuli ("standards") interspersed with target stimuli (to which they had to react with a button press) and novel distractors (the actual stimuli of interest for our analyses).
