Figure 8.26.1.

The social approach apparatus is a rectangular three-chambered box. Each chamber measures 20 cm (length) × 40.5 cm (width) × 22 cm (height). Dividing walls are made from clear Plexiglas, with small openings (10-cm width × 5-cm height) that allow access into each chamber. The center chamber is the start location. The weighted cup on top of the wire cup prevents climbing. The empty wire cup in the right chamber is the novel object. Photobeams are embedded across each doorway. An automated photobeam detector registers time spent in each chamber and number of transitions. This social approach apparatus and the accompanying software program are designed and manufactured by Dold Labs and Engineering.