Outline and description of an electronic system for lateralization of visual stumuli in studies of hemispheric asymmetry

An automatic electronic systenm for lateralization of visual stimuli research on hemispheric asymmetry is described. The system consists of three different units: 1) A stimulas projection‐ unit; 2)an electronic control‐unit; and 3)a programming‐unit. Necessary characteristics of apparatus for studies using lateralized visual stimuli are described in the paper. Among the listed requirements are: range of stimulus‐duration, rise‐ and fall‐time for onset and offset to full intensity of the stimulus, stimulus‐eccentricity, and eye‐fixation control. The system described in the paper has been in use in our laboratory for the last two years. It is concluded that the system meets the requirements for apparatus used in studies with laterlized visual input. A block‐diagram of the electronics and a schematic outline according to scale of the stimulus projection‐unit are enclosed with the paper.