Dear Masako--no, so far there is no way to create trial re-presentation contingencies as a function of a criterion response time. This actually *was* in the plan for version 2010 (now out) but the conversion to Windows Vista and Windows 7 compatibility ended up using most of our programming resources. What you've described is a great idea and we will be pursuing this for the next version (something akin to a "live" Excel file during the session via the Advanced Features used by MediaLab).