Gunnar Johansson (psychophysicist)

Gunnar Johansson was a Swedish psychophysicist. He was interested in motion perception in vision. He helped develop the rigidity assumption which posits that proximal stimuli that can be perceived as rigid objects are generally perceived as such.

His books are linked below:http://books.google.ca/books?hl=en&lr=&id=pFQWr7hIRigC&oi=fnd&pg=PA185&dq=Gunnar+Johansson&ots=E7BaM6vzF7&sig=Mgcoia7wiYEypqdvElO4mOO1YtAhttp://books.google.ca/books?hl=en&lr=&id=pFQWr7hIRigC&oi=fnd&pg=PA29&dq=Gunnar+Johansson&ots=E7BaM6vzF7&sig=MkRtqBbb_txtUBqrAoK5Pu63jtohttp://books.google.ca/books?hl=en&lr=&id=pFQWr7hIRigC&oi=fnd&pg=PA223&dq=Gunnar+Johansson&ots=E7BaM6vzF7&sig=_CTlQhy_rItyf6tY9SFNI4Xg80Mhttp://books.google.ca/books?hl=en&lr=&id=pFQWr7hIRigC&oi=fnd&pg=PA134&dq=Gunnar+Johansson&ots=E7BaM6vzF7&sig=4ekOGrbccbsBfSP5UPHRKB5cOwA