gistfile1.py

# The response time on a given trial can be retrieved in an 
# inline_script item like so:
trial_rt = self.get("response_time")


# Check whether the RT matches your criteria:
if trial_rt > 3000:
	show_feedback = "yes"
else:
	show_feedback = "no"
	
# Make the variable show_feedback available in the interface
# so that you can use it for "Run if" statements:
exp.set("show_feedback", show_feedback)