What impact does syntax highlighting have on students' progress in learning a new programming language?

I'm looking for studies along the lines of the following hypothetical experiment, which involves two groups of students: one group would code in an editor performing poor to no syntax highlighting of the language in question...

![enter image description here](https://i.stack.imgur.com/qsQvw.png)

...while the other group would code in an editor performing comparatively richer syntax highlighting.

![enter image description here](https://i.stack.imgur.com/nNgWG.png)

Do you know of any such studies? Do you have otherwise relevant references? A quick Google search hasn't returned much...