TY - JOUR PY - 1923// TI - The Relation between Field Brightness and the Speed of Retinal Impression JO - Journal of experimental psychology A1 - Cobb, P. W. SP - 138 EP - 160 VL - 6 IS - 2 N2 - The present paper continues the report of an investigation into the problems of retinal sensitivity in which measurement of the shortest time of exposure of a stimulus necessary in order that there may be discrimination between stimulus and no stimulus is adopted as a criterion of sensitivity. The method and apparatus employed were similar to those previously described. There were nine different degrees of illumination of the stimulus-aperture, and five stages in the corresponding brightnesses of the field at the upper range of illumination, and four stages at the lower range. In general, if t represent the threshold time of stimulation, and B the brightness of the experimental field, the relation followed an equation of the form: 1/ t = k log B/ B0, where k and B are constants depending upon experimental conditions. This formula agrees with the laws governing critical flicker-frequency for intermittent stimulation. From Psych Bulletin 20:09:00890. (PsycINFO Database Record (c) 2012 APA, all rights reserved)

LA - SN - 0022-1015 UR - http://dx.doi.org/10.1037/h0073883 ID - ref1 ER -