Whisker system

Definition

The whisker system is a sensorimotor system used by animals such as rodents to collect environmental information. Nerve endings in the follicle convert whisker movement into action potentials and information is transmitted to the somatosensory cortex. Moving the whiskers back and forth – whisking – can provide additional information about objects encountered.

Latest Research and Reviews

  • Research |

    The relationship of resting-state hemodynamics signals to ongoing neural activity is poorly understood. Using optical imaging, electrophysiology, and local pharmacological infusions, Winder et al. found that resting hemodynamic signals were weakly correlated with neural activity and that these hemodynamic fluctuations persisted when neural activity was silenced.

    • Aaron T. Winder
    • , Christina Echagarruga
    • , Qingguang Zhang
    •  & Patrick J. Drew
    Nature Neuroscience 20, 1761–1769
  • Research |

    The authors find that the portion of rat somatosensory cortex representing the trident whiskers—a set of whiskers specialized for ground contact during exploration—encodes information about speed and acceleration of the animal. Microstimulation of this area alters running speed, consistent with the idea that trident whiskers and their neural representation could serve as a tactile speedometer.

    • Edith Chorev
    • , Patricia Preston-Ferrer
    •  & Michael Brecht
    Nature Neuroscience 19, 1367–1373
  • Research | | open

    Barrel cortex contains a functional map of whiskers but how neuronal activity maps multi-whisker inputs has not been studied. Here the authors show that while uncorrelated multi-whisker stimuli activate barrel neurons, correlated multi-whisker inputs activate neurons in a ring at the barrel-septa boundary

    • Luc Estebanez
    • , Julien Bertherat
    • , Daniel E. Shulz
    • , Laurent Bourdieu
    •  & Jean- François Léger
  • Research |

    Feedforward and feedback synaptic pathways shape how neural activity evolves across cortical areas, but they are difficult to monitor using traditional methods during behavior. The authors use pathway-specific and cellular-resolution in vivo imaging to quantify sensory and decision-related neural activity both within and propagating between two cortical areas critical for touch perception.

    • Sung Eun Kwon
    • , Hongdian Yang
    • , Genki Minamisawa
    •  & Daniel H O'Connor
    Nature Neuroscience 19, 1243–1249
  • Research |

    Sensory cortex spiking is well known to predict trial-to-trial variability in perceptual choice, but the origins of this choice-related activity are not fully understood. In the mouse somatosensory system, electrophysiology, imaging and optogenetic experiments reveal a progression of choice-related activity as touch signals flow from primary afferents to cortex.

    • Hongdian Yang
    • , Sung E Kwon
    • , Kyle S Severson
    •  & Daniel H O'Connor
    Nature Neuroscience 19, 127–134

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