Assertoric mindreading

This essay offers an explanation of how assertions express that the speaker has a propositional attitude toward what's asserted. The explanation is that this feature of assertion is owed to a hearer's spontaneous mindreading. I call this the assertoric mindreading hypothesis. Once developed and defended, the hypothesis is used to investigate which attitude is expressed. Since the attitude expressed is the attitude tracked during mindreading, the attitude must have a certain profile. It is argued that only factive attitudes like knowledge have this profile. Non-factive attitudes like belief or acceptance are ineligible.