Variants of the NEWBI Experiment
Localizer design variations
Several variants of the localizer protocols were used to collect additional data. These variants provide concrete examples to explore the analytical effects of varying experimental design and conditions.
Variant 1 – Alternative (Suboptimal) Block Designs
The block design protocols for this variant use alternating blocks of faces and hands. In all cases, stimuli are presented for 0.8s with an intertrial interval of 0.2s. No baselines (fixation points without images) are used. Block duration ranges from 4s to 64s, and all seven run orders have a total run duration of 336s. All block design run orders are described by the following legend and figures.
Order 1
Alternating 16-s blocks of hands and faces
Order 2
Alternating 16-s blocks of faces and hands
Order 3
Alternating 4-s blocks of hands and faces
Order 4
Alternating 4-s blocks of hands and faces with starting and ending hand baselines
Order 5
Alternating blocks of hands and faces with different block durations (8 s for hands and 4 s for faces) with starting and ending hand baselines (16 s).
Order 6
Alternating blocks of hands and faces with different block durations: hands (4 s) and faces (16 s) with starting and ending hand baselines (16 s)
Order 7
Alternating blocks of hands and faces with long block duration (64 s) with ending hand baseline.
Variant 2 – Block and Slow Event-Related Designs with Baselines
This variant integrates baselines (stimulus-free periods) into four block design orders and three slow event related orders. Once again, stimuli are presented for 0.8s with an intertrial interval of 0.2 s. Order durations vary.
Order 1
alternating blocks of baseline (16 s) and stimulus (16 s), where stimulus alternates between faces and hands, ending with additional baseline (16 s). Duration is 336 s.
Order 2
alternating blocks of baseline (16 s) and stimulus (16 s), where stimulus alternates between hands and faces, ending with additional baseline (16 s). Duration is 336 s.
Order 3
Repeating blocks of baseline (16 s), faces (16 s), and hands (16 s), ending with additional baseline (16 s). Order duration is 304 s.
Order 4
Repeating blocks of baseline (16 s), hands (16 s), and faces (16 s), ending with additional baseline (16 s). Order duration is 304 s.
Order 5
Order 6
Order 7