In LIS, as in other sign languages, metaphorical mapping can also be responsible for grammatical features, such as verb agreement. In the example below, the verb head^influence is based on the following metaphor: a good or bad influence is something that can be represented as moving from an agent to a patient.
head^influence
‘(To) influence’
Thus, although the specific verb head^influence does not refer to a physical transfer, it refers to a metaphorical transfer.