Figure 7
The top panel shows an idealized progression of experimental stages depicted in different colours (red, yellow, green, and blue represent spontaneous baseline (B1), uncoupled reactive baseline (B2), tethered stage (CR) and untethered stage (DC), respectively). The entire procedure was planned to span 12 minutes. To investigate whether various AI classification architectures could differentiate between initial infant exploratory movement during tethered interaction from possible intentional activity later in the tethered phase, the current project split the tethered phase into two segments surrounding the most typical timing for infant discovery as indicated by coordination dynamics analysis (i.e., ~ 90s into coupling)20. These two segments were the first minute of infant~mobile coupling (CR1, shaded light green) and the third minute of coupling (CR2, shaded dark green). Outlined in black, we planned to classify movement using two minutes of data for each of B1, B2, CR and DC (with CR split into CR1 and CR2). The bottom panel illustrates the available data for each stage for each of the five infants (S1-S5) relative to the idealized plan. Sliding windows (window width = 5s; overlap = 1s) were used across all experimental stages to assess fluctuations in classification accuracy across time (indicated by small black windows drawn to scale and arrows).
