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Common Mistakes (aka Gotcha’s)

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General Advice

  • Python and therefore PsychoPy is CASE SENSITIVE
  • To use a dollar sign ($) for anything other than to indicate a code snippet for example in a Text Component, precede it with a backslash \$ (the backslash won’t be printed)
  • Have you entered your the settings for your monitor? If you are using degrees as a unit of measurement and have not entered your monitor settings, the size of stimuli will not be accurate.
  • If your experiment is not behaving in the way that you expect. Have you looked at the log file? This can point you in the right direction ? Did you know you can change the type of information that is stored in the log file in preferences by changing the logging level.
  • Have you tried compiling the script and running it. Does this produce a particular error message that points you at a particular problem area? You can also change things in a more detailed way in the coder view and if you are having problems, reading through the script can highlight problems. Reading a compiled script can also help with the creation of a Code Component