sentence: It is also difficult to make predictions for the developmental trajectory of odor associations since some aspects of olfactory perception appear innate and stable over time ( Khan et al ., 2007 ; Soussignan et al ., 1997 ; although see , e.g ., Logue et al ., 1988 ; Maier-N ö th et al ., 2016 ) , and for others , the strong influence of experience on olfaction has also been emphasized ( Brennan & Keverne , 1997 ; Goubet et al ., 2018 , 2014 ; Shankar et al ., 2010 ; Wilson & Stevenson , 2006 ) .