Could The Hearts understand and have memory and feel ..!!! yes ..
Allah said (before 1400 years) : Have they not travelled through the land, and have they hearts wherewith to understand and ears wherewith to hear? Verily, it is not the eyes that grow blind, but it is the hearts which are in the breasts that grow blind.
in this clear word : the Quran Declares that the hearts can understand ! and in other words also declares that the hearts could feel or be blind ..
this theory was mentioned before 1400 ..
and now it is the modern science turn to prove it !
and that really started by lot of Doctors ..like : Paul Pearsall , Linda G. S. Russek , Gary E. R. Schwartz
You can challenge the Quran by proving that the hearts can't understand ... and the Quran challenge is not only in that but in every statement and every word and every info and every Miracle .. no body could find any single error all these years .. and the challenge still there for those smart people..