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Scientific Solutions ^®

ReAct ^TM Reaction Time Measurement System

Scientific Solutions ReAct system (pictured is system, joystick and monitor with target display)

Scientific Solutions ReAct is a system to measure human reaction / response time.  The system is a complete turn-key solution that can be used to measure the reaction time of people in a controlled repeatable environment.

The system consists of a computer based workstation (computer, keyboard, mouse, monitor) to which a joystick is connected.  Integrated in the workstation is a Scientific Solutions LabMaster DPCI data acquisition card.  The Scientific Solutions ReAct software runs from the workstation and presents targets in various locations on the computer screen and measures the response time for the subject-under-test to move the cursor onto the target using the attached joystick.

The Scientific Solutions ReACT system measures various parameters including;

• RT - Reaction Time
• MT - Movement Time
• HT - Homing Time
• TRT - Total Response Time

• BF - Boarder Faults
• DE - Directional Error
  

The test administrator easily defines the test using an EPIC script file.  By editing this EPIC file, the test administrator has control over various test configuration conditions including:

• Number of times to repeat a particular target
• Foreground and Background color
• Delay time for target to appear
• Delay time between the end of one trial and the start of the next
• Audible sound at the start of trial
  
• Audible sound at the end of trial
• Target Distance from center 0,0 position
• Target Angle from center 0,0 position
• Target Size
• Target initial color and color change with cursor overlay
• Initial Cursor x,y position
• Cursor Size
• Cursor initial color and color change with target overlay
• Joystick Mode of Velocity or Positional
• Joystick Axis Gain
• Joystick Axis Rotation
• On-screen comments to test subject
  

The ReAct software is self-calibrating to accommodate various joystick and screen resolutions without requiring redefining the test configuration.  This allows for similar test conditions across different screen size and resolutions.

Data is collected and logged into a standard text format that can be imported into other programs for graphing and analysis.

The workstation is implemented in a small footprint configuration especially suited for the ReACT hardware and software.  The system is typically enhanced with integrated mass storage devices, network connections, high resolution and fast response integrated 32-bit graphics processor, Universal Serial Bus ports and IEEE 1394 firewire ports.  Joystick connections are typically in front for convenient and easy attachment.

Previous response time measurement systems utilized an analog joystick with an external amplifier for the x-axis and y-axis signals.  These amplified analog signals were then fed into a LabMaster DMA product for Analog-to-Digital Conversion (ADC).  The digital information obtained from the A/D Conversion was then stored in the computer.  The LabMaster DMA on-board counter/timers were used to precisely measure the reaction times of the joystick movement.

This newer version of the ReAct system utilizes digital joysticks instead of the older analog joysticks.  With a digital joystick, the Analog-to-Digital Conversion (ADC) of the x-axis and y-axis signals occur in the joystick.  This digital data is then transmitted into the computer using a Universal Serial Bus (USB) port of the workstation.  The ReAct software uses the integrated LabMaster DPCI to assist in making fast and precise time response measurements.

ReACT Part Numbers

Part Number	Photo	Product Overview
815210		ReACT Software Single System Software License Includes LabMaster DPCI interface card for a PCI slot.
815202		ReACT Workstation Base computer system with keyboard and mouse Graphic Display sold separately
0301130		ReACT Joystick Digital Joystick with standard USB connection