A jsPsych plugin for visual analogue scales

Visual analogue scales (VASs) allow survey respondents to specify their answers with a high degree of precision, unlike Likert-type scales in which only a few categorical responses are available. In web-based research, HTML sliders (in which the respondent drags and drops a marker) are sometimes used as a substitute for VASs, but sliders produce data of a lower quality than true point-and-click VASs. Here, I introduce a plugin for jsPsych that enables survey responses using a true VAS, enabling researchers to collect self-report data on a continuum without the drawbacks of sliders.