This is not the study. It is an article talking about the research. It contains a link to the scientific paper (here it is: https://www.pnas.org/doi/full/10.107

This is not the study. It is an article talking about the research. It contains a link to the scientific paper (here it is: https://www.pnas.org/doi/full/10.1073/pnas.2120529119 https://www.pnas.org/doi/full/10.1073/pnas.2120529119 ) which unfortunately is not open access. The abstract is accessible, though (abstracts are short summaries with the most important information about the work). Edit: this seems to be an earlier pre-print: https://www.researchgate.net/publication/354631823_Methylphenidate_as_a_causal_test_of_translational_and_basic_neural_coding_hypotheses/fulltext/61435a8bb5bdf5148e2826b7/Methylphenidate-as-a-causal-test-of-translational-and-basic-neural-coding-hypotheses.pdf?origin=publication_detail https://www.researchgate.net/publication/354631823_Methylphe...