Brandeis Piano Conservatory

From Piano/Software Manufacturers:

http://www.steinway.com/news/articles/piano-for-body-mind-and-soul/

http://www.paceyspianos.com/page.php?p=40

http://www.adventus.com/resources/Music-and-the-Brain-How-Important-is-Music-to-A-Childs-Development.php

From Piano Teachers Groups:

http://pianoteachersfederation.org/Benefits_of_Piano

http://pianonet.com/resources/publications/benefits-of-playing-the-piano/

Articles:

http://www.parentingscience.com/music-and-intelligence.html

http://www.pbs.org/parents/education/music-arts/the-benefits-of-music-education/

http://news.emory.edu/stories/2012/07/hanna_pladdy_music_brain/campus.html

Academic Studies:

http://www.ericdigests.org/2004-3/cognitive.html

http://www.dana.org/news/publications/detail.aspx?id=10752

http://web.utk.edu/~rsmeltze/Additional%20Coursework/EP525/SmeltzerAdultPianoWiki.pdf

http://www.escom.org/proceedings/ICMPC2000/Sun/Costakey.htm

Of course there are many, many more studies and articles are available on the web supporting the fact that the study of the piano and music supports a person's intelligence and overall, long-term brain health.