Psycho-Physics as a discipline within the psychology began with the work Elemente de Psychophysics ( Elements Of Psychophysics ), written by German philosopher and physicist Gustav theodor Fechner. He actually aimed at developing a method that relates mind ( psych ) to matter ( physics ). So Psychophysics is the scientific study of the relation between stimulus and sensation.
Every five enslaved persons would count as three free persons.
The migration of Indian population can be an apprehensive approach (or an approach that would spark fear or anxiety that may lead to xenophobia) to Western nation through 'invading' or increasing the population density of foreign immigrants that are not part of the Western culture.