The progressive appearance of ‘connection-pairs’ belonging to the various circuits during development.
Figures are generally photos, graphs and static images that would be represented in traditional pdf publications.
Time along x-axis is represented in discrete time steps. The circuits associated with sensory feedback and survival appear sooner. Note that appearance is with respect to both neurons that are connected in the adult being born at that time, actual synaptogenesis may occur at a later time. The dashed line represents the time of hatching. (NR – Nerve Ring and VNC – Ventral Nerve Cord)