Behavior Research Methods & Instrumentation

, Volume 15, Issue 6, pp 594–597 | Cite as

Control of CRT intensity via Apple II software

  • Larry Hochhaus
  • Steve Carver
  • Joe Ray Brown
Computer Technology


An inexpensive, easy-to-build device for the Apple II microprocessor is described. The modification permits software control of four levels of relative screen intensity (contrast) settings for any video monitor. The relationship of the technology to choice reaction time and perception research is briefly indicated. Principles governing operation of the modification are also discussed. Finally, a set of step-by-step instructions for building the device is provided.


Choice Reaction Time Video Signal Video Monitor NAND Gate Picture Signal 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Reference note

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Copyright information

© Psychonomic Society, Inc. 1983

Authors and Affiliations

  • Larry Hochhaus
    • 1
  • Steve Carver
    • 1
  • Joe Ray Brown
    • 1
  1. 1.Department of PsychologyOklahoma State UniversityStillwater

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