Temporal and Spatial Adaptations during the Acquisition of a Reversal Movement

Abstract

Adjustments of the biphasic movement in a coincidence anticipation task were studied using an erroneous knowledge of results (KR) paradigm. Forty participants received either no KR, correct KR, erroneous (+100 ms) KR or 100 trials of correct KR followed by 50 trials of erroneous KR Kinematic analyses revealed that for this 100–50 KR group the extension part of the movement was temporally adjusted under the influence of erroneous KR Although accompanied by a decrease in movement amplitude, this did, not account for the temporal shift in movement outcome, because all groups showed a reduction in amplitude. It is argued that changing external time constraints mainly results in temporal adaptations. However, spatial adaptations do play a role in kinematic changes during acquisition.

Key Words:

• invalid feedback
• movement patterns
• kinematics
• erroneous knowledge of results