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I'm surprised they didn't mention jumping spiders (Salticidae), which are notable because they are inverts, have the ability to see an unusual number of colors

I'm surprised they didn't mention jumping spiders (Salticidae), which are notable because they are inverts, have the ability to see an unusual number of colors, and unlike the mantis shrimp can be trained on them. Also another advantage is they can be rewarded with sugar water. Evolutionarily, their eyesight is a marvel. No other spiders really have anything approaching it. https://news.nationalgeographic.com/2015/05/150518-jumping-spider-color-vision-mating-animals-science/ https://news.nationalgeographic.com/2015/05/150518-jumping-s... I have a couple as pets (https://medium.com/@melissamcewen/how-i-ended-up-with-pet-jumping-spiders-187d70a3e296 https://medium.com/@melissamcewen/how-i-ended-up-with-pet-ju...) and sometimes have managed to get them interested in videos of other bugs but I'd like to develop something geared just towards them. There are a couple of things like this used in the lab, but nothing open sourced that I know of.

gerbilly 9y ago
I love jumping spiders. I sometimes feed them little droplets of honey from a toothpick (I leave it along their path) and they sometimes spend a few minutes drinking from it. I also play with them and get them to chase a laser pointer, being careful to keep it away from their eyes.
- RepressedEmu 9y ago
  Will spiders actually chase a laser pointer? Or was that last part a joke?
  - gerbilly 9y ago
    It's not my video, but here's an example: https://www.youtube.com/watch?v=vyG7U9PIlyM https://www.youtube.com/watch?v=vyG7U9PIlyM
sillysaurus3 9y ago
Keep in mind that they see a different spectrum. Any video you want to show them may need to be projected with special software or hardware to make those images look like bugs. (It's not necessarily true, but worth thinking about.)
- yathern 9y ago
  Even if they saw the same spectrum - if they have more cones, their sight won't be RGB-based, and so an RGB screen would look kinda posterized (eg the famous Obama 'HOPE' poster)
  - sillysaurus3 9y ago
    This is actually touching on a deep observation I've spent many years thinking about. A hypothetical perfectly-realistic CG rendering would need to be perfectly realistic to animals as well as humans. Then you "capture" the realistic rendering using a virtual camera, which happens to look real for humans. It's computationally infeasible, but the strategy seems correct. (No one has ever achieved a perfectly realistic 100% synthetic video of complex scenes. It's good to keep such mountains on your radar -- someone will conquer it one day, but how? Could it be you?)
    - yathern 9y ago
      > A hypothetical perfectly-realistic CG rendering would need to be perfectly realistic to animals as well as humans. That's not necessarily a true assumption - unless you mean realistic as in an exact light-propagation simulator, not realistic as in fooling humans. On the nanometer-scale there are things that happen with refraction that would probably be more accurately done if using wavelengths and photon energy as the units, start-to-finish. But at the end of the day, the models we use for rendering are already extremely effective - the uncanny valley arises with how we use them. > No one has ever achieved a perfectly realistic 100% synthetic video of complex scenes I get what you're saying, but that's a little bit subjective, like the turing test. Some people see some CGI scenes in movies and are shocked to find out they weren't real. Some people see a real scene and complain about how bad the CGI is! An interesting litmus test is Moff Tarkin. Some people were shocked they found a perfect lookalike, and had no clue it was CG. Some people were apalled at how poorly it was done.
      - sillysaurus3 9y ago
        It's important to qualify the claim: - 100% CG: no mixing in real life footage. - video. No still frames. - reasonably complex scenes. Think nature documentary. - reasonably long: 30 seconds or more. - not a degenerate scene: it would be bogus if the camera was fixed, staring at a tree stump. The overall thrust of these criteria is that no one, anywhere, has achieved fully realistic CG video. And this is easy to demonstrate. If we had that capability, you'd be able to fool people in a double blind test so that they wouldn't be able to pick out real video from fakes any better than random chance. In a scientific setting, a nature video will wipe the floor with our best CG video ten out of ten times.
julianh95 9y ago
Very nice write-up. You have inspired me to look into building a terrarium and keeping some spiders. I had a Green Lynx Hunter outside my backdoor for awhile and he was so nice to watch. Also, I hate to be "that guy" but I found a few grammatical errors towards the end of your post. The first being with "No, not poisonous, but all spiders produced venom..."(produced > produce) and "Their are no jumping spiders that have venom"(Their > There). /grammar policing over :P Otherwise awesome article, thanks for the inspiration!
- mamoswined 9y ago
  Oh thanks! I fixed them.
scrumper 9y ago
I just this morning on the train finished the rather enjoyable Children of Time by Adrian Tchaikovsky, which features a planet of sentient Portia Labiatas. Then came your comment and your lovely Medium article, which made me realize that the author had not overstated the characteristics of these animals at all. You may enjoy the book if you like sci-fi.
ravenstine 9y ago
Jumping spiders are simply amazing. Everything about them changed my perspective on spiders and arachnids, and I can no longer say I hate spiders.
- katastic 9y ago
  > say I hate spiders. Well, you hate them (and snakes) because evolutionary you're supposed to [for survival].
rectangletangle 9y ago
unlike the mantis shrimp can be trained on them Interesting, IIRC mantis shrimp are considered one of the more intelligent forms of arthropod. Perhaps it's just not the correct sensory system to communicate with them through. Evolution is certainly capable of honing an organ system's acuity independently from the organism's brain/CNS. On a related note, it's amazing how many times eyes have seemed to independently evolve. And once they do occur in a species, it takes a lot of evolutionary pressure to get rid of them. Troglobites or stygobites generally still have atrophied vestigial eyes, despite being adapted to a purely subterranean environment. It would seem with the relatively stable ecosystem a cave would provide, stabilizing selection over a long while would select for no eyes. However vestigial eyes are still common, which I suspect implies the metabolic cost to fitness ratio of eyes must be strongly in favor of having eyes, even if barely functional.
- mamoswined 9y ago
  Yeah I wouldn't be surprised if they were a bit more intelligent than jumping spiders through it's hard to judge relative intelligence in animals like these. For mantis shrimp color training probably doesn't resemble anything they encounter in the wild. For jumping spiders, they use colors for sexual selection in most species and also color is a major signal for "poisonous" in their prey — i'm not sure that's the case with mantis shrimp.
  - rectangletangle 9y ago
    You are right, it is difficult to compare intelligence here, because it's predicated on some objective measure of intelligence. It's also difficult because the ways intelligence can manifest can look very different depending on the instance. Perhaps a more general term like "sophisticated" would be appropriate, seeing as they've adapted highly complex responses to a very dynamic and complex environment. Biology as a field is riddled with these definition based problems, because the phenomena it's used to describe are just so intricate. Another similar problem is the "species problem," where we find countless attempts at an objective and universal definition for differentiating species, but little consensus. In the case of mantis shrimp it's probably the stimulus being too foreign to the organism for it to have a meaningful response, like you said. So it's probably just ignoring the stimulus until it to goes away. It may also be the organism's adaptation to an environment with many diverse predators (like a shallow water reef would have). So any unusual stimulus is automatically interpreted as threatening. If they have a tendency to freeze when exposed to acute stress, it may just be their manifestation of the fight-or-flight response. This could probably be measured by comparing nervous system arousal between threatening and foreign stimulus.
rhcom2 9y ago
Wow what a rabbit hole you've sent me down. Check out this diagram of the jumping spiders (almost) completely 360 field of view. https://en.wikipedia.org/wiki/Jumping_spider#/media/File:Jumping_spider_vision_David_Hill.png https://en.wikipedia.org/wiki/Jumping_spider#/media/File:Jum... Have you been able to breed them?
- mamoswined 9y ago
  Yeah, but no longer, it was very time consuming to care for them all. You have to care for them daily and a lot of them die anyway.
moonwalkr 9y ago
Have you read the book Children of Time? It's a sci-fi novel with (sentient) jumping spiders as protagonists.
- maaark 9y ago
  I was literally about to reccomend this book! It's very good!

gerbilly 9y ago

I love jumping spiders. I sometimes feed them little droplets of honey from a toothpick (I leave it along their path) and they sometimes spend a few minutes drinking from it. I also play with them and get them to chase a laser pointer, being careful to keep it away from their eyes.

RepressedEmu 9y ago
Will spiders actually chase a laser pointer? Or was that last part a joke?
- gerbilly 9y ago
  It's not my video, but here's an example: https://www.youtube.com/watch?v=vyG7U9PIlyM https://www.youtube.com/watch?v=vyG7U9PIlyM

sillysaurus3 9y ago

Keep in mind that they see a different spectrum. Any video you want to show them may need to be projected with special software or hardware to make those images look like bugs. (It's not necessarily true, but worth thinking about.)

yathern 9y ago
Even if they saw the same spectrum - if they have more cones, their sight won't be RGB-based, and so an RGB screen would look kinda posterized (eg the famous Obama 'HOPE' poster)
- sillysaurus3 9y ago
  This is actually touching on a deep observation I've spent many years thinking about. A hypothetical perfectly-realistic CG rendering would need to be perfectly realistic to animals as well as humans. Then you "capture" the realistic rendering using a virtual camera, which happens to look real for humans. It's computationally infeasible, but the strategy seems correct. (No one has ever achieved a perfectly realistic 100% synthetic video of complex scenes. It's good to keep such mountains on your radar -- someone will conquer it one day, but how? Could it be you?)
  - yathern 9y ago
    > A hypothetical perfectly-realistic CG rendering would need to be perfectly realistic to animals as well as humans. That's not necessarily a true assumption - unless you mean realistic as in an exact light-propagation simulator, not realistic as in fooling humans. On the nanometer-scale there are things that happen with refraction that would probably be more accurately done if using wavelengths and photon energy as the units, start-to-finish. But at the end of the day, the models we use for rendering are already extremely effective - the uncanny valley arises with how we use them. > No one has ever achieved a perfectly realistic 100% synthetic video of complex scenes I get what you're saying, but that's a little bit subjective, like the turing test. Some people see some CGI scenes in movies and are shocked to find out they weren't real. Some people see a real scene and complain about how bad the CGI is! An interesting litmus test is Moff Tarkin. Some people were shocked they found a perfect lookalike, and had no clue it was CG. Some people were apalled at how poorly it was done.
    - sillysaurus3 9y ago
      It's important to qualify the claim: - 100% CG: no mixing in real life footage. - video. No still frames. - reasonably complex scenes. Think nature documentary. - reasonably long: 30 seconds or more. - not a degenerate scene: it would be bogus if the camera was fixed, staring at a tree stump. The overall thrust of these criteria is that no one, anywhere, has achieved fully realistic CG video. And this is easy to demonstrate. If we had that capability, you'd be able to fool people in a double blind test so that they wouldn't be able to pick out real video from fakes any better than random chance. In a scientific setting, a nature video will wipe the floor with our best CG video ten out of ten times.

julianh95 9y ago

Very nice write-up. You have inspired me to look into building a terrarium and keeping some spiders. I had a Green Lynx Hunter outside my backdoor for awhile and he was so nice to watch. Also, I hate to be "that guy" but I found a few grammatical errors towards the end of your post. The first being with "No, not poisonous, but all spiders produced venom..."(produced > produce) and "Their are no jumping spiders that have venom"(Their > There). /grammar policing over :P Otherwise awesome article, thanks for the inspiration!

mamoswined 9y ago
Oh thanks! I fixed them.

scrumper 9y ago

I just this morning on the train finished the rather enjoyable Children of Time by Adrian Tchaikovsky, which features a planet of sentient Portia Labiatas. Then came your comment and your lovely Medium article, which made me realize that the author had not overstated the characteristics of these animals at all. You may enjoy the book if you like sci-fi.

ravenstine 9y ago

Jumping spiders are simply amazing. Everything about them changed my perspective on spiders and arachnids, and I can no longer say I hate spiders.

katastic 9y ago
> say I hate spiders. Well, you hate them (and snakes) because evolutionary you're supposed to [for survival].

rectangletangle 9y ago

unlike the mantis shrimp can be trained on them Interesting, IIRC mantis shrimp are considered one of the more intelligent forms of arthropod. Perhaps it's just not the correct sensory system to communicate with them through. Evolution is certainly capable of honing an organ system's acuity independently from the organism's brain/CNS. On a related note, it's amazing how many times eyes have seemed to independently evolve. And once they do occur in a species, it takes a lot of evolutionary pressure to get rid of them. Troglobites or stygobites generally still have atrophied vestigial eyes, despite being adapted to a purely subterranean environment. It would seem with the relatively stable ecosystem a cave would provide, stabilizing selection over a long while would select for no eyes. However vestigial eyes are still common, which I suspect implies the metabolic cost to fitness ratio of eyes must be strongly in favor of having eyes, even if barely functional.

mamoswined 9y ago
Yeah I wouldn't be surprised if they were a bit more intelligent than jumping spiders through it's hard to judge relative intelligence in animals like these. For mantis shrimp color training probably doesn't resemble anything they encounter in the wild. For jumping spiders, they use colors for sexual selection in most species and also color is a major signal for "poisonous" in their prey — i'm not sure that's the case with mantis shrimp.
- rectangletangle 9y ago
  You are right, it is difficult to compare intelligence here, because it's predicated on some objective measure of intelligence. It's also difficult because the ways intelligence can manifest can look very different depending on the instance. Perhaps a more general term like "sophisticated" would be appropriate, seeing as they've adapted highly complex responses to a very dynamic and complex environment. Biology as a field is riddled with these definition based problems, because the phenomena it's used to describe are just so intricate. Another similar problem is the "species problem," where we find countless attempts at an objective and universal definition for differentiating species, but little consensus. In the case of mantis shrimp it's probably the stimulus being too foreign to the organism for it to have a meaningful response, like you said. So it's probably just ignoring the stimulus until it to goes away. It may also be the organism's adaptation to an environment with many diverse predators (like a shallow water reef would have). So any unusual stimulus is automatically interpreted as threatening. If they have a tendency to freeze when exposed to acute stress, it may just be their manifestation of the fight-or-flight response. This could probably be measured by comparing nervous system arousal between threatening and foreign stimulus.

rhcom2 9y ago

Wow what a rabbit hole you've sent me down. Check out this diagram of the jumping spiders (almost) completely 360 field of view. https://en.wikipedia.org/wiki/Jumping_spider#/media/File:Jumping_spider_vision_David_Hill.png https://en.wikipedia.org/wiki/Jumping_spider#/media/File:Jum... Have you been able to breed them?

mamoswined 9y ago
Yeah, but no longer, it was very time consuming to care for them all. You have to care for them daily and a lot of them die anyway.

moonwalkr 9y ago

Have you read the book Children of Time? It's a sci-fi novel with (sentient) jumping spiders as protagonists.

maaark 9y ago
I was literally about to reccomend this book! It's very good!