Figure 1.

A: Head movements in response to sinusoidally moving stimuli of two different spatial frequencies. Red: Sequences, which were automatically identified as tracking behavior. B: Automatically identified tracking behavior at different spatial frequencies (blue: median, N=12) in comparison to random head movements in absence of a stimulus (red line: median, dashed: standard deviation) and to the threshold detected by a human observer (green).

Kretschmer and Kretzberg BMC Neuroscience 2012 13(Suppl 1):P104   doi:10.1186/1471-2202-13-S1-P104