Automatic Apparatus for Stimulus Presentation and Recording in Visual Threshold Experiments*†

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Abstract
An apparatus is described which automatically controls the presentation of light stimuli and records subjects’ responses in visual threshold experiments. The apparatus includes: (a) A tape reader which controls the magnitude and time of occurrence of light stimuli, in accordance with the location of holes in a programming tape, and (b) a punch recorder which makes a permanent record of the conditions of each light stimulus and of the responses made by each of four subjects. The accuracy of the stimulus-producing equipment is monitored. Electric counters tally the correct responses made by each subject for each magnitude of light stimulus.
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