Abstract
Observers can learn to move in novel, adapted environments after watching a learning or expert model. Although this is an effective practice technique, it is unclear how this learning is achieved and if observers update an internal model of their visual–motor environment, as shown through the presence of after-effects (i.e., negative carry-over effects when aiming in a normal environment following exposure to perturbed conditions). For such updating to occur via observational practice, it has been reasoned that the observer requires the motor capabilities to perform the task they are observing. To test this, we first trained three groups to physically move in clockwise (CW) or counterclockwise (CCW) rotated environments. When immediately returned to a normal environment, after-effects were seen. We then attempted to wash out these effects before allowing two of these groups (CW and CCW), and a naïve observation only group, to watch a video of an actor performing in a CW environment. This observation phase was immediately followed by another test for after-effects and a direct test of learning when aiming in the rotated environment. Consistent with previous data, there were direct learning effects due to observation. Although after-effects increased for the experienced observers, these were small and were not significantly different from a physical practice only group that did not undergo the observation phase. Therefore, even with a motor repertoire for the rotated environment, there was a lack of evidence that observational practice results in implicit (re)updating of an internal model for aiming.
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Notes
There were originally n = 12 participants in the ActCCW + Obs group, but during the analysis stage one individual was removed due to unusually low errors in practice and subsequent knowledge that they had participated in a previous, similar experiment. We tested a couple more participants in our primary condition (ActCW + Obs) to allow greater confidence in our conclusions.
We also looked at after-effects on a smaller time scale (i.e., a cycle of 5 trials, rather than a 25 trial block), to see if potential after-effects dissipated quickly. There was no evidence that this was the case with after-effects remaining relatively consistent within a 25-trial block. We ran a 4 Group × 2 Block × 5 Cycle Repeated Measures ANOVA. None of the effects involving cycle were significant (F < 1 for the cycle main effect).
Based on a Reviewer’s suggestion, we considered the possibility that after-effects in Phase II might be reduced for a group who had two phases of CW physical practice, potentially as a result of the additional blocks of washout interspersed before the second test for after-effects. This raises the possibility that the small after-effects we saw from our previous ActCW groups (ActCW + Obs; ActCW_only) would have been observed even after a second physical practice phase. Testing of six individuals ActCW + ActCW who underwent the same washout procedures showed this not to be the case. After-effects following a second phase of physical practice were M = −20.88° (Block 1) and M = −15.49° (Block 2), similar to the size of the after-effects after the first physical practice block (Block 1, M = −20.40 and Block 2, M = −14.65°). These values were of a significantly greater magnitude than those seen by the groups who had only one phase of CW physical practice and they were also commensurate with the Posttest1 data from these two groups (ActCW_only and ActCW + Obs).
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This research was supported by a Discovery Grant to the final author from the Natural Sciences and Engineering Research Council of Canada (NSERC).
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Lim, S.B., Larssen, B.C. & Hodges, N.J. Manipulating visual–motor experience to probe for observation-induced after-effects in adaptation learning. Exp Brain Res 232, 789–802 (2014). https://doi.org/10.1007/s00221-013-3788-6
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DOI: https://doi.org/10.1007/s00221-013-3788-6