Chapter 4 – Sequential Effects in the Central Cue Posner Paradigm: On-line Bayesian Learning

This study analyzes (1) the effects caused by the validity/invalidity of the signal in one trial and (2) how a correct or incorrect prediction in one trial induces changes in the processing of the next trial (sequential effects). Event-related potentials showed an increased P3a and P3b in invalid trials and sequential effects were observed in the contingent negative variation (CNV), showing a greater negativity in trials preceded by valid trials. The greater positivity in P3a and P3b in invalid trials confirms the influence of the validity/invalidity of the cues, and reflects the different processes of attentional reorientation and updating of working memory, respectively. The increased negativity of CNV, showed the influence of the previous trial on the current processing trial (sequential effects). These results support the “Bayesian Brain Model” by showing a dynamical adjustment of the deployed attention as a function of previous trial outcome.