Be warned – spiders can hear you

❝ While jumping spiders are known to have great vision, a new Cornell University study proves for the first time that spiders can hear at a distance.

The discovery runs counter to standard textbook wisdom that claimed spiders could only detect nearby sounds.

❝ A study describes how researchers used metal microelectrodes in a jumping spider’s poppy-seed-sized brain to show that auditory neurons can sense far-field sounds, at distances up to 3 meters, or about 600 spider body lengths.

In further tests, researchers stimulated sensitive long hairs on the spider’s legs and body – previously known to pick up near-field airflow and vibrations – which generated a response in the same neurons that fired after hearing distant sounds, providing evidence the hairs are likely detecting nanoscale air particles that become excited from a sound wave…

❝ The techniques open up studies that link neurology with behavior in all spiders, Ron Hoy said. Gil Menda has since found evidence of hearing in five different spider species: jumping spiders, fishing spiders, wolf spiders, netcasting spiders and house spiders.

Future work by Hoy’s lab will investigate audio perception from lyriform organs and will better investigate audio neurons in the brain. The findings could have applications for using hairlike structures for extremely sensitive microphones, such as in hearing aids.

I wonder if they’ll investigate Google spiders? Har.

Meanwhile, RTFA. A delightful tale of accidental discoveries and cross-discipline cooperation.

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