Mirror Writing: Learning, Transfer, and Implications for Internal Inverse Models.

In a study of the effects of practicing mirror writing, the effects of transfer to the nonpracticed hand and to nonpracticed phrases were assessed in 185 students. Large transfer effects were observed. An interpretation of those effects is based on a suggestion that the learning led to the creation of a new internal inverse model (or a modification of a pre-existent model) mapping the space of task variables onto the space of internal variables.