Update README.md

Author: carlashworth

README.md

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 [![GitHub forks](https://img.shields.io/github/forks/swati-rajwal/pain_monitoring_task.svg?style=social&label=Fork)](https://github.com/swati-rajwal/pain_monitoring_task/network/)
 
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+This continuous pain rating task assesses pain intensity using the open-source software PsychoPy [1] hosted on Pavlovia [2]. At the start, participants are provided with detailed instructions and asked to complete a short practice run to ensure they understood how the application worked. Once this is completed, participants continuously rated their pain for approximately five minutes on a vertical scale ranging from "Least Pain" to "Most Pain."
 
 The interface of the application and the experiment timeline are depicted in Figure 1:
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