Elements of Psychophysics, Volume 1

able according activity afterimages appears average error body calculated changes color compared constant errors corresponding depends determined deviations differential sensitivity discussion E. G. Boring E. H. Weber effect equal experimental experiments extent external fact fatigue Fechner geometric series given Gustav Theodor Fechner hand heavier hemeralopia illumination increase influence inner psychophysics intensive sensations intrinsic light investigation irradiation judgment kinetic energy Leipzig lifted limits magnitude mathematical means ments method of average method of right Methods of Measurement noticeable differences number of right number right perceived perception photometric physical position potential energy procedure proportional psychic psychology psychophysical processes pulse rate ratio relationship respect retina right and wrong Rochon prism shadow sound intensities standard weight stellar magnitudes stimulus difference stimulus increments temperature tion validity values variable vibrations viewing distance visual angle Volkmann Weber's Law weight lifts Wört