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Psychophysical Tracking Method to Measure Taste Preferences in Children and Adults
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Pleasantness Only?

Uta Sailer1, Marlene Hausmann2, Ilona Croy2

  • 1Department of Behavioural Medicine, Institute of Basic Medical Sciences, Faculty of Medicine, University of Oslo, Norway.

Experimental Psychology
|October 28, 2020
PubMed
Summary
This summary is machine-generated.

Gentle touch pleasantness, often linked to C-tactile (CT) afferents, also involves sensory attributes. This study reveals that CT afferent stimulation influences pleasantness and other sensations, not just emotions.

Keywords:
C-tactile fibersaffective touchdiscriminativegentle touchhedonicsocial touchtactile

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Area of Science:

  • Neuroscience
  • Somatosensation
  • Psychophysics

Background:

  • Unmyelinated C-tactile (CT) afferents are theorized to mediate the pleasantness of gentle touch.
  • The relationship between CT afferent firing rates and perceived pleasantness is not fully understood.
  • Previous research suggests CT afferent activity correlates with hedonic aspects of touch, but this link may be inconsistent.

Purpose of the Study:

  • To investigate the sensory and emotional attributes associated with varying velocities of gentle touch.
  • To determine if the inverted U-shaped pleasantness curve extends to other sensory and emotional ratings.
  • To explore the role of CT afferents beyond purely hedonic or emotional coding.

Main Methods:

  • Participants were subjected to gentle stroking at different velocities.
  • Subjective ratings of sensory and emotional attributes were collected for each velocity.
  • Analysis focused on identifying inverted U-shaped patterns in the rating data.

Main Results:

  • Pleasantness and 'not burdensome' ratings exhibited an inverted U-shaped pattern, peaking at approximately 3 cm/s.
  • The sensory attribute 'rough' also showed an inverted U-shaped rating pattern.
  • CT afferent stimulation appears to contribute to a broader range of perceived sensations than previously assumed.

Conclusions:

  • CT afferent stimulation is not exclusively associated with hedonic or emotional experiences.
  • The perception of touch involves a central integration of signals from CT afferents and other mechanoreceptors.
  • The salience of specific sensory aspects may depend on the integration of multiple afferent inputs during stimulation.