Figure 7
From: Invisible noise obscures visible signal in insect motion detection
Masked grating visual stimuli used in the experiment. (A,D) Spatiotemporal Fourier spectra, (B,E) space-time plots and (C,F) still frames of the visual stimulus in two conditions of the experiment. Panels (A–C) represent a no-noise condition: the stimulus is a moving grating at 0.0185 cpd and 8 Hz with no added noise. Panels (D–F) represent a masked condition: the stimulus consists of the same signal grating but with non-coherent temporally-broadband noise added at 0.05 cpd. There were in total 44 conditions in the experiment (4 unmasked and 40 masked gratings). Noise was always temporally broadband and its spatial frequency varied across conditions (in the range 0.0012 to 0.5 cpd).
