http://www.leaderu.com/orgs/tul/psychtoday9809.html http://www.leaderu.com/orgs/tul/psychtoday9809.html stimuli stimuli http://www.leaderu.com/orgs/tul/psychtoday9809.html http://www.leaderu.com/orgs/tul/psychtoday9809.html Hopson2 Fetal Psychology http://www.leaderu.com/orgs/tul/psychtoday9809.html http://www.leaderu.com/orgs/tul/psychtoday9809.html http://www.leaderu.com/orgs/tul/psychtoday9809.html stimuli Hopson