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A Pat on the Back Statistically Improves Free Throw Numbers in Basketball
(www.goodnewsnetwork.org)
The data showed that the chance of scoring rose when teammates showed their support through touch. The effect only appeared after a failed first shot, which makes sense because such a scenario is likely to spike stress levels.
Of course, the data is not shown. And the study is not able to draw causal conclusions. In this case, they've hunted around and found a subset of shots (second shots after a first failed shot) where it's true. And it's easy to make up reasons after the fact why that might make sense.
It does seem very reasonable to hypothesise that supportive team mates make it less likely you choke on the second shot. But they haven't shown this is down to touch (they just used that as a proxy for supportive team mates). Nor that the percentage of successful second shots after a failed first shot would be improved by more touching regardless of whether team mates are genuinely supportive or quietly seething..