Acredolo, L. P. (1979). Laboratory versus home: The effect of environment on the 9-month-old infant's choice of spatial reference system. Developmental Psychology, 15(6), 666-667.
http://dx.doi.org/10.1037/0012-1649.15.6.666
55 9-mo-olds watched while an object was hidden under a cloth to their left or a cloth to their right. They were then moved to the opposite side of the table and allowed to search. Since no trials training a reach in one direction were included, the child's choice of the incorrect cloth from the new position was interpreted as reliance on a spatial reference system based on the child's body, rather than on repetition of a learned motor habit. Striking environmental effects were found. Infants tested in a landmark-free laboratory and an unfamiliar landmark-filled office behaved egocentrically; those tested in their homes did not. (6 ref) (PsycINFO Database Record (c) 2016 APA, all rights reserved)