File:Flash_lag.gif
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Summary
DescriptionFlash lag.gif |
English: The flash-lag effect. When a visual stimulus moves along a continuous trajectory, it may be seen ahead of its veridical position with respect to an unpredictable event such as a punctuate flash. This illusion tells us something important about the visual system: contrary to classical computers, neural activity travels at a relatively slow speed. It is largely accepted that the resulting delays cause this perceived spatial lag of the flash. Still, after several decades of debates, there is no consensus regarding the underlying mechanisms. See https://laurentperrinet.github.io/publication/khoei-masson-perrinet-17/ |
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Source |
Own work This file is easily generated using Python with the following libraries: numpy, gizeh, moviepy: import os import numpy as np import gizeh as gz import moviepy.editor as mpy figpath = '../figures' W, H = 1000, 600 r = -W/64 duration = 3. start = duration*.2 stop = duration*.8 duration_flash = .05 fps = 50 flash = gz.rectangle(lx=r, ly=r, xy=(W/2., H/2.-r), fill=(0,1,0)) def make_frame(t): surface = gz.Surface(W, H, bg_color=(0, 0, 0)) if np.abs(t-duration/2) < duration_flash: flash.draw(surface) if start < t < stop: rect = gz.rectangle(lx=r, ly=r, xy=(W*t/duration, H/2.+r), fill=(1,0,0)) rect.draw(surface) return surface.get_npimage() clip = mpy.VideoClip(make_frame, duration=duration) clip.write_videofile(os.path.join(figpath, 'flash_lag.mp4'), fps=fps) |
Author | LaurentPerrinet (talk) (Uploads) |
Other versions | File:Flash lag.gif full animation — File:Flash lag Frame073.gif green dot flash (Frame 073) |
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10 February 2017
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 13:51, 10 February 2017 | 1,000 × 600 (30 KB) | LaurentPerrinet | The flash-lag effect. When a visual stimulus moves along a continuous trajectory, it may be seen ahead of its veridical position with respect to an unpredictable event such as a punctuate flash. This illusion tells us something important about the visu... |
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