http://books.google.com/books?id=IHGdmrKlVl0C&pg=PA57&lpg=PA57&dq=testosterone++%22logical+reasoning%22&source=bl&ots=Gv8nl0Iba6&sig=n-3q-R7Eso-Nv7XxaDQIlgHWmvY

http://books.google.com/books?id=IHGdmrKlVl0C&pg=PA57&lpg=PA57&dq=testosterone++%22logical+reasoning%22&source=bl&ots=Gv8nl0Iba6&sig=n-3q-R7Eso-Nv7XxaDQIlgHWmvY&hl=en&ei=SJO5TbPjOMrZsga24sDrAw&sa=X&oi=book_result&ct=result&resnum=4&ved=0CC4Q6AEwAw#v=onepage&q=testosterone%20%20%22logical%20reasoning%22&f=false http://books.google.com/books?id=IHGdmrKlVl0C&pg=PA57&#3... http://www.ncbi.nlm.nih.gov/pubmed/3067252 http://www.ncbi.nlm.nih.gov/pubmed/3067252 This relates to women, but this applicable to mens too: http://en.wikipedia.org/wiki/Hypogonadism#In_men http://en.wikipedia.org/wiki/Hypogonadism#In_men Difficulty concentrating Memory Loss-difficulty in choosing words in language