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Tactile Semiautomatic Passive-Finger Angle Stimulator TSPAS
Published on: July 30, 2020
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Evidence for tactile 3D shape discrimination by octopus
Kendra C Buresch1, Noelle D Huget2, William C Brister2
1Marine Biological Laboratory, 7 MBL Street, Woods Hole, MA, USA. kburesch@mbl.edu.
Summary
Octopus arms use touch to identify prey, but this ability may decline with age. Chemical cues may be more important than touch for prey discrimination in octopuses.
Area of Science:
- Marine Biology
- Neuroethology
- Robotics
Background:
- Octopuses integrate visual, chemical, and tactile senses for foraging in complex environments.
- Benthic octopuses rely heavily on arm-based sensory exploration to find hidden prey.
- Octopus suckers contain chemo- and mechanoreceptors, but mechanosensation is less understood than chemoreception.
Purpose of the Study:
- To investigate the mechanosensory capabilities of Octopus bimaculoides arms and suckers in discriminating 3D shapes.
- To assess the role of mechanotactile sensing in prey identification, independent of chemical cues.
- To explore potential age-related changes in mechanosensory prey discrimination.
Main Methods:
- Developed a non-invasive behavioral assay using live Octopus bimaculoides.
- Presented 3D-printed shapes (prey and non-prey) with identical chemical signatures within a rock dome.
- Observed octopus arm and sucker responses to isolated mechanosensory stimuli.
Main Results:
- Octopus responses to shape discrimination varied.
- Young octopuses successfully discriminated the crab prey shape from controls.
- Older octopuses did not show significant discrimination based on shape alone.
Conclusions:
- Mechanotactile sensing of 3D shapes can contribute to prey discrimination in octopuses.
- Chemotactile information may be prioritized over mechanotactile information during prey selection.
- Mechanosensory prey discrimination abilities may decrease with age in octopuses.
