Holcombe:SamTatamProtocol

SUPA Sydney University Perception and Action Lab Primer editing help refcard

Rhythm without motion

Program is called Set Hz of screen!!!Rhythm5thPressWork4.py

Checklist when running the program:

• Should be using Viewsonic G810 as the screen (brightness and contrast setting same as AlexWhite—contrast 100%,brightness between G and H in word BRIGHTNESS that appears on the screen)
• Unplug second screen
• 120 Hz (better double-check, because when disconnect second monitor sometimes it resets
• 800 by 600 pixels
• Tap button box with each flash, and tap actual button on 5th flash
• 150 trials per session
• 7, 27, and 120 cd/m^2 (.25, .5, 1 nominal vals)

Methods notes

• startingDist had only two possible values, so first flash occurred either 1 sec or 533ms in
• calculated flash timing appears to be for mid-time of flash, not onset. So need to retrospectively fix data
• I see there were two "print" statements between button box clock start command and stimulus drawing start. These print statements might take time
• also I see that s.flushInput() is called *after* starting button box clock with s.write('e5'). Is this wise?

Data analysis, Sam method

• Delete 5 rows up to header line (keep header line)
• luminance ratio is actually targetyPositionX column
• Delete all columns except subj, targetyPositionX, timePressRecorded
• then delete header row
• then SPSS +/- 250 ms was excluded as outliers, -99 means no response

new version march 09

• using mitsubishi diamond pro 2070 SB, contrast 100%, brightness 100% (which makes background quite bright)
• making fixation dimmer
• using lums .08, .32, 1
• tap to each of 8 from 3rd flash

Holcombe:LightLatency