This thesis explores conflict in reasoning using a mouse-tracking paradigm that measures participants' instantaneous attraction towards competing response options. It focuses on two kinds of conflict: between competing sources of information in inductive reasoning, and between "Type 1" and "Type 2" processes in Dual Process accounts of reasoning. The mouse-tracking data reveal under what circumstances conflict occurs, at what points in time participants are influenced by different factors, and something of the qualitative nature of this conflict.