#Psychopy get loop number how to#
#Psychopy get loop number code#
#Psychopy get loop number trial#

You’ll start with a comparison of some different paradigms used by programming languages to implement definite iteration. Here’s what you’ll cover in this tutorial: In Python, indefinite iteration is performed with a while loop.

#Psychopy get loop number code#

Indefinite iteration, in which the code block executes until some condition is met.

Definite iteration, in which the number of repetitions is specified explicitly in advance.

Repetitive execution of the same block of code over and over is referred to as iteration.

In the previous tutorial in this introductory series, you learned the following:

#Psychopy get loop number how to#

This tutorial will show you how to perform definite iteration with a Python for loop. Watch it together with the written tutorial to deepen your understanding: For Loops in Python (Definite Iteration) The keyboard component can access that to judge whether the response is correct or not.Watch Now This tutorial has a related video course created by the Real Python team. I don't know how you are handling the responses, but you will also probably need a ninth column in the conditions file that indicates what the correct response is. on the first iteration within each trial, the image filename would come from column image0, the second from image1, and so on. Then in the image field, put something like this: lets say the 8 columns in your conditions file are labelled 'image0', 'image1', etc. In the image stimulus image field, you can construct the image name to use on each presentation. Instead of duplicating routines, you repeat them via the loops. So note that you no longer have 24 separate routines in Builder but only two (the fixation and image routines). The inner loop is not connected to a conditions file and is simply set to run 7 times. the fixation routine will run 24 times (once per outer loop), and the image routine will run 7×24 times (i.e. Third, you need a second, inner loop, nested within the outer one. This is connected to the conditions file, and encompasses all of the routines (the pre-trial fixation and the image routine. Second, you need a loop to control the trials.

#Psychopy get loop number trial#

It will need 8 columns: 7 to specify the unique images in a trial and an eighth to specify the repeated one.

Yes, you're correct that there is a (much) more efficient way to do this.įirst, start with your conditions file (i.e.csv or. I hope my question makes sense and I would be grateful for any assistance. Probe refers to a number between 1 and 7 which references the position of the image in the sequence shown in the trial.) How can I instead get Builder to create a loop which contains the fixation screen (constant), the trial loop (picking the next seven unique objects (they are named sequentially from 1-168), and then a probe/response which is unique to each trial (I have these in an input file as follows. The code works, but it is very long, and if I wanted to change something in the fixation or the probe/response, I would need to change each of the 24 trials individually. I have then created separate routines for the pre-trial fixation screen (constant for all 24 trials) and the response (probe image and correct answer manually programmed). I have created a loop which shows the seven objects in succession. In my current code I have created 24 separate input files, each containing a list of the unique objects. Each trial will show 7 unique images, then 1 image which may or may not be from the 7, and users are then asked to enter y/n if they have seen the image before. I have made something that works, but I can tell it's inelegant and there must be a better way. I am new to programming, and need some help with an experiment I'm constructing in PsychoPy builder.