Tactile Foveation in the Star-Nosed Mole

@article{Catania2003TactileFI,
  title={Tactile Foveation in the Star-Nosed Mole},
  author={Kenneth C Catania and Fiona E. Remple},
  journal={Brain, Behavior and Evolution},
  year={2003},
  volume={63},
  pages={1 - 12}
}
Star-nosed moles have a specialized somatosensory system with 22 mechanosensory appendages surrounding the nostrils. A pair of appendages (the 11th pair on the ventral midline) acts as the tactile fovea and is used for detailed investigations. Here we used a high speed video camera to document movements of the star while moles searched for small prey items. Mole foraging behavior was very fast; the star, which is just over a centimeter in diameter, was touched to different areas of the… 

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References

SHOWING 1-10 OF 34 REFERENCES

Somatosensory fovea in the star‐nosed mole: Behavioral use of the star in relation to innervation patterns and cortical representation

It is reported that the 11th, ventral ray is the behavioral focus of the nose of the star‐nosed mole and has the largest cortical representation, greatest area of cortex per sensory organ, and the highest innervation density per sensory organs.

Somatosensation in the superior colliculus of the star‐nosed mole

An SC dominated by somatosensory inputs in which neurons in all layers responded to mechanosensory stimulation is reported, forming a topographic representation of contralateral body dominated by the mechanosensor star of the star‐nosed mole.

Receptive fields and response properties of neurons in the star-nosed mole's somatosensory fovea.

The small receptive fields, short latencies, and inhibitory surrounds are consistent with the star's role in rapidly determining the locations and identities of objects in a complex tactile environment.

Organization of the somatosensory cortex of the star‐nosed mole

The results suggest that the primary somatosensory cortex, S1, has an unusual ventrolateral location and orientation with representations of mouth, nose rays, facial vibrissae, forepaw, and trunk in a rostrocaudal sequence.

Early development of a somatosensory fovea: a head start in the cortical space race?

The foveal appendage led development in the periphery, had the greatest innervated surface area in embryos, and developed mature nerve terminals and epidermal sensory organs first; also, in developing cortex, markers for metabolic activity (cytochrome oxidase) appeared first in the fovea representation.

Discharge characteristics of single units in superior colliculus of the alert rhesus monkey.

The aim of the present study was to investigate the discharge characteristics of single units in the superior colliculus of the alert, unanesthe tized monkey and to assess both the visual receptivefield characteristics of units and the possible relation of unit discharges to eye movement.

Distributed spatial coding in the superior colliculus: a review.

Evidence that the superior colliculus of the midbrain represents visual direction and certain aspects of saccadic eye movements in the distribution of activity across a population of cells is reviewed.

Experience-induced plasticity of cutaneous maps in the primary somatosensory cortex of adult monkeys and rats

Structure of the Proboscis and Rays of the Star-Nosed Mole, Condylura cristata

Varied lengths of the rays, uniform distribution of the sensory papillae containing the Eimer receptors, and proximity of the nerve endings to the surface of the stratum corneum support the hypothesis of electrosensitivity in addition to tactile function for this adaptive complex.

Neurology of saccades and smooth pursuit.

During the period covered by this review a number of papers have been published on saccade and smooth pursuit research, conducted experimentally in monkeys and clinically in humans. In monkeys, using