Previously seen and expected stimuli elicit surprise in the context of visual search
Attention Perception & Psychophysics (2016) - Comment
pubmed: 26742498  doi: 10.3758/s13414-015-1052-9  issn: 1943-3921  issn: 1943-393x 

James D. Retell, Stefanie I. Becker, Roger W. Remington