Table 1.
Weight comparisons.
| Number of cameras | 1 | 2 | 4 | 8 |
|---|---|---|---|---|
| RS-306 camera alone (g) | 0.18 | 0.36 | 0.72 | 1.44 |
| RS-306 camera assembly (g) | — | 0.68 | 1.64 | 2.16 |
| RS-306 Electrophysiology/camera assembly (g) | — | 2.56 | 3.51 | 4.03 |
| Adafruit 1937 camera alone (g) | 0.5 | 1.0 | 2.0 | 4.0 |
| Adafruit camera assembly (g) | 1.28 | 2.55 | 5.10 | 10.24 |
| Adafruit Electrophysiology/camera assembly (g) | 4.28 | 5.55 | 8.10 | 13.24 |
Camera assemblies include the cameras, structural carrier, LEDs, resistors, wiring, and connectors. Adafruit assembly also includes IR mirrors. Our 2-camera and 4-camera assemblies correspond to the configurations used in Figures 4C, 2A, respectively. We have not constructed an 8-camera headset but rather estimated weights from the parts shown in Figure 6. “—” indicates not tested, since we only constructed multi-camera headsets. Electrophysiology/camera assembly includes a camera assembly, electrophysiology headstage (Part #17), EIB (Part #32), and implant base (Part #27). Weights for the Adafruit camera assembly are from the single-camera system described in Meyer et al. (2018), which we extrapolated for multiple cameras. The weight of the Adafruit Electrophysiology/camera assembly was estimated by adding an electrophysiology headstage (Part #17, 1 g) and flexDrive (Voigts et al., 2013, 2 g), but does not include the weight of a custom aluminum implant base (Meyer et al., 2018). Mass of cement and/or skull screws is not included. An adult mouse can support ~4 g at most (Voigts et al., 2013).