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This is a demo to show how one can use slider position to change the opacity of an image (in this case: a lightbulb).

This example demonstrates a combination of continuous and categorial sliders in the same routine.

This experiment demonstrates how to create a rating slider that moves only when its marker is selected. Simply selecting other areas on the slider won't work.

This experiment demonstrates image scaling depending on spreadsheet conditions.

This experiment demonstrates how to prevent a routine from ending unless a rating has been chosen.

The participant must rate and press the 'space' button to end the routine.

A basic demo of a psychophysics staircase, using orientation discrimination.

task switching

A Working Memory Test

First upload of task for P03

Balloon Analogue Risk Task (BART)

The experiment: ——

This is a simplified (and prettified) version of the BART task by Lejuez et al (2002). Participants have to blow up a balloon that they know will burst at some point. They ‘earn’ rewards for getting the balloons to be larger, but increase the risk of bursting it, in which case they earn no reward for that balloon. The question is, how many times does someone pump each balloon trying to optimise their rewards.

The measure is designed to quantify individual differences in risk-taking.

Analysing your data: ——

You should filter out data where the balloon burst and measure the number of pumps made for the remaining trials.

Notes: ——

WARNING: This is an advanced demo involving lots of code components

This can be extended to be more similar to the original paper by adding further colours of balloons with different bursting profiles.

The classic Stroop task.

In this task participants are required to memorise and recall number series in order. Participants start out with three 3-digit sequences. If participants correctly recall 2 out of 3 three sequences, they progress to 4-digit sequence trials and so on. If participants respond incorrectly on 2/3 trials the experiment terminantes. This experiment is based on the original digit span experiment by Jacobs (1887).

A forward and Backward Digit Span test for Working Memory The test adapts to participnts' answers and a score is calculated following Woods et al. (2012)