Table 2.

Quantification of axonal behavior in the two locations

		Net growth rate (μm/hr)	Rate during advance (μm/hr)	% Advance	% Pause	% Retraction
IC	Mean	17.26	55.01	79.40	12.86	7.73
	SD	4.44	29.67	10.54	5.25	7.37
VIZ	Mean	8.39	42.34	37.53	37.56	24.91
	SD	5.34	12.67	13.50	16.14	11.11

Net growth rate was calculated as the change in axon length over the total observation time, and rate during advance is the change in axon length during periods of advance only. The percentage of advance, pause, and retraction values indicates the percentage of consecutive 5 min intervals that the axons spent in advance, pause, and retraction, respectively (also see Materials and Methods). For the two axons that moved from the IC into the VIZ during the period of observation, these parameters were calculated separately for each location.