Birdsong and grooming are examples of neuronal trajectories that can be interpreted by relatively simple reader mechanisms due to their limited variability. In contrast, large recurrent circuits can generate numerous trajectories, each of which can become a meaningful pattern when matched to experiences. The richness of the information depends not on the sequence pattern generator but on the reader mechanisms. This may explain why the neocortex (reader) is so much larger than the sender (hippocampus).
