Yoshida blamed Vita's sparse showing on Sony's attempt to cut the length of its press conference compared to previous years.
"As far as how our conference went - it went as well as we thought it could," he said. "I'm getting lots of tweets from people saying, 'where are PS Vita games?' That was, in retrospect, our fault - not looking at every angle when we designed the programme for the show. We have 25 new games, Vita titles, playable on the show floor.
"We could have spent more time - probably we should - showing off those games coming out this year.
"That aside, we got a very great response to our new IPs - Beyond by Quantic, and The Last of Us. So I'm very happy."