Check out the Table 1 on page 1104, for summary of different studies. Of particular interest is the people-things orientation the parent poster mentions, with mean effect size across multiple studies so large (d = 1.18) that it almost never occurs for non-tautological research questions.
Sure, it has been studied to death. Here's a good summary:
http://sci-hub.cc/10.1111/j.1751-9004.2010.00320.x
Check out the Table 1 on page 1104, for summary of different studies. Of particular interest is the people-things orientation the parent poster mentions, with mean effect size across multiple studies so large (d = 1.18) that it almost never occurs for non-tautological research questions.