Experimental Brain Research

, Volume 145, Issue 3, pp 403–406

Time processing reflected by EEG surface Laplacians

Research Note


We previously described significant relationships between amplitude variations in slow brain potentials and timed between-press intervals (2.5 s). We suggested that these variations are neural traces of timing mechanisms. To determine which time processing stage is concerned, the current study examines whether these variations result from trial-to-trial memory updating controlled by feedback or from memory consolidation. EEG surface Laplacians (SL) were computed from the first trial on, with feedback (condition 1) and after feedback suppression (condition 2). Performance-dependent variations were related to the individual memory traces revealed by condition 2. As in our previous data, they were restricted to a site overlying the supplementary motor area (SMA). The data suggest that the SMA subserves timing functions, involving memory consolidation and cumulative activation processes as described by current models.


Time processing Supplementary motor area Slow brain potential changes Laplacians 


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Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  1. 1.Centre de Recherche en Neurosciences Cognitives, CNRSMarseille CedexFrance
  2. 2.IMNSSA, Service de Santé des ArméesToulonFrance

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