Creating expt with feedback based on subject's response

Builder
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1

**Win10
**PsychoPy version v2021.2.0
**Anaconda

Hi everyone, I’m very new to PsychoPy. I’m trying to create an experiment which can provide a different picture feedback to every trial depending on the response the subject has made. For example, if the subject chooses A in Trial 1, a picture feedback “Trial1_A” should appear and if the subject chooses B, a picture feedback “Trial1_B” should appear. The feedback pictures for every trial are different. There is a total of 35 trials.

Moreover, I created a simple experiment without the feedback part. However, the laptop screen turns dark when the experiment ends. It’s like screen brightness has been reduced to minimum. And cue?

Many thanks!

2

There’s two ways to do this:
One is the same as in the “branched experiment” demo, essentially you create a routine with different images in, make a loop around each and set the nReps attribute of these loops to 1 or 0 according to the participants’ response.

However, as the only thing you’re varying is the image, it may actually be cleaner to just set the image according to response. I would make a Variable :variable: component with a value like this:

{'a': "path/to/image1.png", 'b': "path/to/image2.png"}

And then set the value of the image to “set every repeat” and be myVariableName[response] (where myVariableName is whatever you called your variable component and response is either a or b according to participants’ response)

3

Thank you so much for the reply!
Since the two feedback images for each trial is different, I tried to use the Code component instead of using the Variable component.

if resp.keys == ‘a’:
feedback_image = feedback_a
else:
feedback_image = feedback_b

And then in the Image component, the value of Image is $feedback_image. I do have an excel file specifying the feedback_a and feedback_b images for each trial.
Do you think this will work?