In the first study, 59 college students looked at 25 photographs of men enrolled in a business school program. Ten of the men had shaved heads while the rest wore their hair in various styles and lengths.
Volunteers rated the photos of men with shorn scalps as more dominant, meaning they looked more powerful, influential, and authoritative than those with a full head of hair.
In a second experiment, 344 adults were shown photographs of four different men. One photo was of the man's real hair and a second shot of him had been digitally altered to remove all of it.
Adults rated men with the digitally shaved heads as more dominant than his coiffed counterpart, an effect researchers say was largely due to perceiving men with shorn scalps as having more confidence and masculinity.