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Related Concept Videos

Tactile and Chemical Senses01:27

Tactile and Chemical Senses

292
Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex.
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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.

Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
|March 13, 2024
PubMed
Summary
This summary is machine-generated.

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.

Keywords:
Octopus bimaculoidesCephalopod behaviorMechanoreceptionMultisensory integrationPrey discriminationSensory perception

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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.