An opponent of Frederic Bartlett,  this man's name
An opponent of Frederic Bartlett,  this man's namesake illusion consists of a circle surrounded by larger circles,  which appears larger than the same circle flanked by smaller circles. He tried to apply Fechner's theories to higher mental processes in works like The Intelligence of Schoolchildren  and he wrote a treatise on color vision based on a double pyramid. He is best known, however ,for his innovations in psychological experimentation, discovering the serial position curve, and devising the word completion test. FTP, identify this psychologist, best known for his work On Memory.
An opponent of Frederic Bartlett,  this man's namesake illusion consists of a circle surrounded by larger circles,  which appears larger than the same circle flanked by smaller circles.
Hermann Ebbinghaus