Boundary extension phenomenon (Intraub & Richardson, 1989) refers to a memory distortionoccuring when an observer tends to remember a perceived scene. Subjects generally tend tooverestimate the scope of the scene, including to their representation details that the originalscene did not contain, but likely to be present. Although BE is described as a robustphenomenon, observer’s chacteristics can modulate it (Mathews & Mackintosh, 2004 ;Munger, Owens, & Conway, 2005). Studies exposed here intend to examine in more detailthis question, by testing the effects of knowledge relative to larger scene context, expertknowledge, or reactivity of the observer to emotional stimuli on the phenomenon. Our resultsshow a modulation of BE (i.e. reduction, or disappearance) by these factors
