Hawking gradually lost the use of his hand , and in 2005 he began to control his communication device with movements of his cheek muscles , with a rate of about one word per minute .
[ 65 ] Hawking gradually lost the use of his hand , and in 2005 he began to control his communication device with movements of his cheek muscles , [ 69 ] [ 70 ] [ 71 ] with a rate of about one word per minute .