Dragonflies are 5 times faster than humans? Different organisms see the world at different speeds? Different shades of time?

【Investigating the perceived “speed of time”! The speed of the world is 400 times different between a dragonfly and a starfish!】


・Kevin Healy of the National University of Ireland Galway (NUIG), Galway, Ireland, investigates the ability of “time perception” in more than 100 species of organisms.

Measure how fast each organism can detect flashes of light

If you can perceive 50 flicker times per second, the time resolution is expressed as 50 Hz (hertz)

Human temporal resolution averages 65 Hz, meaning that we can detect light flashes as fast as 65 times per second.

75 Hz for dogs, 96 Hz for salmon, and the highest temporal resolution among vertebrates is 146 Hz for the sparrow flycatcher

・The number one temporal resolution in the biological world is 300 Hz for dragonflies and blowflies

・The lowest temporal resolution is 0.7 Hz in starfish

・It seems that the pace at which organisms live in their environment affects their time perception. The faster a predator moves, the higher its temporal resolution was shown to be.


These are the quotes from the article




Do different organisms see the world at different speeds? Different shades of time?



Perhaps the reason flies are not easily caught is that human movement appears to be in slow motion to them.


What was a bit surprising to me personally was that the average human temporal resolution was 65 Hz.


Incidentally, TV and movies we usually watch are generally 24 to 30 fps (frame rate).

It means,

Roughly speaking, one second of video consists of 24 to 30 still images.

(The image of watching a 1-second parapara cartoon composed of 24 to 30 pictures)


If the human temporal resolution is 65 Hz (65 flashes are perceived in 1 second), then TV and movies at 24-30 fps are not enough for the resolution (smoothness) of moving images? I was wondering if 24-30 fps TV and movies are not enough for video resolution (smoothness).


By the way, here are the fps for video posting services and social networking sites

  • YouTube:60fps
  • Twitter:40fps(60fps)
  • Instagram:40fps
  • Facebook:30fps
  • TikTok:unknown


It is a strange imagination, but if a dragonfly or a fly, which has 300 Hz perception, about five times that of humans, were to watch a TV or a movie, would it look like a crackling, parallel comic strip? Would it look like slow motion?^^


once again、


Humans perceive a second in 65 small segments.

Dragonflies and flies perceive 300 segments per second.


In a one-second world, a dragonfly or a fly can see more worlds (single pictures?) than a human being, by 235 divisions. A still picture?) (I think they are almost the same picture). (I think they are almost the same picture.)


The life span of dragonflies and flies is very short compared to humans. (a few months).

So, dragonflies and flies leave this world without knowing what the world will be like in a few years.

On the other hand, humans live for decades,


From the perspective of the total amount we perceive in a lifetime, perhaps there is not much difference between humans, dragonflies, and flies.


These were the kind of fantasies I would have.^^


Yes, yes,

We often talk about things like “time is more about shades of gray than length.”

The secret of the shading of time may lie in the division of time.


Although it is extreme to talk about how much we can perceive in a second, as in this case, it may be very important to think about how much we can perceive or feel something in a minute, an hour, a month, or a year.


Like feeling and savoring every moment.^^


I have thought about various interesting and over-the-top ideas from the time resolution story.


See you then.


This discussion of time resolution is interesting in a different way than the concept of time regarding heart rate speed and life span.




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