Figure 2.

Change in skill performance during multiple SVIPT training sessions. Increasing values on the y-axis (skill parameter) represent improved performance through change in the speed-accuracy tradeoff function. Epochs on the x-axis show data in 30 trial increments for each of the training sessions completed over a period of 24 hours. The reactivation block (R) at the start of Session 2 is an average of 15 trials. Large rectangles represent training sessions that contain 4 blocks of 30 trials. Small rectangles shown for groups AA'A₃₀A, AAA₃₀A represent training sessions that contain 2 blocks of 30 trials. Dashed line reflects training with the variable intervention and solid line reflects training with the original skill task. (A) Exposure to A' (AA'A) during reconsolidation strengthened skill A in Session 3. Strengthening was not present for participants that continued to practice A during Session 2 (AAA) or for participants that did not receive an intervention (A-A). Bar graph inset shows the effect of the intervention on strengthening the performance of A (Δ skill B9-B4). Skill strengthening was greater for AA'A than AAA and A-A. (B) Skill strengthening was not found when A' preceded learning A (A'AA), when A' preceded consolidation of A (AA'₃₀A), or when A' was repeated during Sessions 1 and 2 (A'A'A). These controls are shown with respect to a re-plotting of the AA'A data. Note (*): Δ skill for A'AA (B9-B8) differed from AA'A and AA'₃₀A (both B9-B4) in order to match the training exposure for skill A. (C) Strengthening was not found just 30 minutes after exposure to A' (AA'A₃₀A, Session 2, 6.5hr), but was found after enough time was given for reconsolidation to occur (Session 4, 24hr). Replication of the strengthening effect is shown in bar graph inset. Data are means +/− SEM.