Enabling high grayscale resolution displays and accurate response time measurements on conventional computers

Area of Science:

• Vision science
• Neuroscience
• Psychophysics

Background:

• Conventional graphics cards offer 8-bit gray level resolution, insufficient for many vision research experiments.
• Existing solutions for higher luminance resolution can be costly or complex.

Purpose of the Study:

• To present the VideoSwitcher and RTbox as cost-effective, high-performance tools for vision research.
• To enable high-resolution monochromatic displays and accurate response time measurements.

Main Methods:

• The VideoSwitcher combines analog video signals using a resistor network and active circuit for high-resolution displays.
• The RTbox utilizes a microprocessor and high-resolution clock for precise, buffered response time recording via USB.
• Both systems offer synchronization capabilities with external triggers.

Main Results:

• The VideoSwitcher enables inexpensive high-resolution monochromatic displays with conventional hardware.
• The RTbox provides accurate response time measurements, unaffected by host computer processing delays.
• Both systems facilitate synchronization with physiological recordings and external events.

Conclusions:

• The VideoSwitcher and RTbox are valuable, accessible tools for advancing vision research.
• These devices improve experimental accuracy and simplify data acquisition for researchers.
• Further information and demonstration programs are available online.