Paternal care may influence perceptions of paternal resemblance

From the book : Evolutionary Psychology 8 issue 3 : 516-529.
Father-child resemblance is increasingly attracting attention from researchers interested in studying paternal investment.
The current study sought to determine whether a quasi-experimental infant massage intervention would increase father’s perceptions of resemblance.
The study included a dozen fathers in each of two groups: the first received an intensive series of lessons on infant-father massage along with their infants, while the second group served as a neutral control.
We failed to find significant correlations between paternal investment and resemblance, but we found that fathers who participated in the infant massage intervention reported significantly larger post-study ratings of resemblance and lower ratings of paternal stress.
This suggests that the relationship between father-child resemblance and paternal investment may be bidirectional.