Test of the validity of the judged sensory ratio of 1 : 2

Garner found that observers judged the sensory ratio of 1:2 invalidly; howe ver, it is possible that in Garner's experiment judgments were influenced b y the different sets of variable stimuli used for the test. This paper repo rts an experiment designed to test the validity of the judged sensory ratio of 1:2 without using different sets of variable stimuli. Bipolar continua of brightness and darkness were used. Participants first adjusted a brightn ess so that it was the double of a standard brightness located between the middle and the black end of the brightness continuum and subsequently adjus ted a brightness so that it was the double of this double (the quadruple of the original standard brightness), or adjusted a darkness so that it was t he double of a standard darkness located between the middle and the white e nd of the darkness continuum and subsequently adjusted a darkness so that i t was the double of this double (the quadruple of the original standard dar kness). Participants reported quadruples of each standard even if such quad ruples could not exist on the bipolar continuum. This confirms that partici pants judged the sensory ratio of 1:2 invalidly.