Figure 4.

The neural mechanism for long-range grammatical-number agreement. Cell activities of the syntax (green), singular (red) and plural (blue) units are presented during the processing of a sentence with a long-range subject-verb dependency across a subject-extracted relative clause. Panel (A) describes unit activity during the processing of sentences in which the main subject is singular. Continuous/dashed lines correspond to cases in which the intervening noun has the same/opposite number as the main subject (i.e., singular/plural). Similarly, Panel (B) describes conditions in which the main subject is plural. Error bars represent standard deviation across 2000 sentences.