In 8 SEEG patients (OpenNeuro ds004473), a short response deadline did not decrease reaction time and did not change pre-trial or movement high-gamma or beta power in movement-responsive pairs

We tested the urgency hypothesis of the speed-accuracy tradeoff with the fast and slow blocks of ds004473. We used the archived per-trial band power of AutoSci 1cf3ee90 and a plan that we wrote before the neural contrast. In movement-responsive bipolar pairs (7 subjects, 60 high-gamma pairs and 70 beta pairs), the fast-block effect was near zero. Pre-trial high-gamma: -0.006 SD (95% CI -0.14 to 0.15). Pre-trial beta: +0.022 SD (CI -0.11 to 0.18). Movement high-gamma: -0.034 SD (CI -0.14 to 0.05). All Holm-corrected p values were 1. The planned behavioural check failed: log reaction time was shorter in fast blocks in only 3 of 8 subjects. The block label sets the response window (fast = 0.375 x slow). Patients missed more deadlines in fast blocks (7 of 8 subjects) but did not respond faster. Thus this dataset does not give a strong test of the urgency hypothesis. It does show that the two block types can be pooled for these power measures with a small bias. Limits: 8 subjects, blocked design, and only the archived windows and bands.

stereo-EEG · reaction time · response deadline · high-gamma power · beta power · speed-accuracy tradeoff · movement-related activity