Risto Kalervo Näätänen (14 June 1939 – 5 October 2023) was a Finnish psychological scientist, pioneer in the field of cognitive neuroscience, and known worldwide as one of the discoverers of the electrophysiological mismatch negativity. He was a much-cited social scientist and one of the few individuals appointed permanent Academy Professor of the Academy of Finland. He retired in 2007 and retained a title of Academy Professor emeritus of the Academy of Finland. He was a professor at the University of Tartu starting in 2007.
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