AUTHOR=Perry Lynn K. TITLE=To have and to hold: looking vs. touching in the study of categorization JOURNAL=Frontiers in Psychology VOLUME=6 YEAR=2015 URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2015.00178 DOI=10.3389/fpsyg.2015.00178 ISSN=1664-1078