BIOL 1001 Lecture : Lecture 9 DNA
Document Summary
The beginning of psychophysics: psychophysics = the science of relating mathematically aspects of sensation/perception of stimuli with aspects of the physical properties of stimuli, the seeds of psychophysics (and therefore psychology) lie in the work of johann herbart. Main contribution he developed the idea of a quantitative threshold for apperceptive mass". Apperception = a concept borrowed from leibnitz, conscious awareness of perceptions. Apperceptive mass = the mathematical assimilation of the totality of conscious ideas. Ideas have varying strength, and if they are opposites they weaken or inhibit each other. Only when the summation of the strength of ideas reaches a certain magnitude do they enter the consciousness. The strength of the apperceptive mass required to enter consciousness is the apperceptive threshold. Ernst weber: the ratio of the increment threshold" to the intensity of the standard" or background stimulus" is. (i) = back ground stimulus a constant: experimental proof:
