Editing Product placement (section)

====Measurement of the explicit memory====
Explicit effects are measured by recall or recognition tests. Subjects are asked to name the products that he or she noticed ([[free recall]]).<ref name="Herrmann et al. 2011" /><ref>{{cite journal|last1=Duke|first1=Charles R.|title=Exploratory Comparisons of Alternative Memory Measures for Brand Name|journal=Psychology and Marketing|date=1995|volume=12|issue=1|pages=19–36|doi=10.1002/mar.4220120103}}</ref> This survey can be also aided by giving additional information like a specific product category.<ref name="Babin and Carder 1996" /> At recognition tests, a selection of products is shown to the interviewed person, who then needs to select the ones that he has seen before.<ref name="Vollmer and Mizerski 1994" /><ref name="Gupta and Lord 1998" />