Figure 6 : Differential ERP waves. a) Scalp topography of theReaching minus the Keypress condition (left) and of theReaching-Stepping minus the Reaching condition (right) in the -1500/0 ms interval. b) Source analyses of the two differential waves in the same interval. The head and the brain representations have a posterior point o view.
Discussion
The aim of this study was to identify possible different patterns of brain activity associated with the anticipation and planning of three different externally-triggered actions with an increasing level of complexity in terms of body segments involvement. Results showed that although all actions required similar early premotor and parietal activities, three different patterns of later brain preparation preceding each different type of action were identified.