Test implementation

Common system settings

• Screen refresh rate
  60 Hz, if possible
• Audio
  44100 Hz if possible, with a fixed bit depth of 16

Test 1 - Stimulus presentation latencies

• Wait once 10 s before starting the procedure to allow equipment to be initialized
• Present a black screen for 300 ms (18 frames), followed by the simultaneous onset of a TTL pulse (255, offset with 0), a white square (top center of the screen, 400 x 400 pixels), and a sound (sine wave, 440 Hz), all lasting 200 ms (12 frames); repeat this 1000 times

Test 2 - Response time latencies

Keyboard

• Wait once 10 s before starting the procedure to allow equipment to be initialized
• Present a black screen for 300 ms (18 frames), followed by a white square (top center of screen, 400 x 400 pixels) for 200 ms (12 frames), and measure (and log) the subsequent keyboard response time; repeat this 1000 times

Serial port (PsychoPy, OpenSesame & Expyriment only)

• Wait once 10 s before starting the procedure to allow equipment to be initialized
• Present a black screen for 300 ms (18 frames), followed by a white square (top center of screen, 400 x 400 pixels) for 200 ms (12 frames), and measure (and log) the subsequent serial port response time; repeat this 1000 times

External equipment

Test 1 - Stimulus presentation latencies

• Record audio onsets and offsets at speaker jack
• Record visual onsets and offsets on screen
• Record the TTL pulses

Test 2 - Response time latencies

Keyboard

• Trigger keyboard response 100 ms after onset of white square at top center of screen

Serial port (PsychoPy, OpenSesame & Expyriment only)

• Trigger serial port response 100 ms after onset of white square at top center of screen