Study of the Effect of Proprioceptive Stimuli in the Stomatognathic Area on Visual Perception, With and Without Sound

Summary

The goal of this observational study is to investigate how oral proprioceptive stimuli affect visual perception and auditory-visual integration in healthy young adults. The main questions it aims to answer are:

* Can Oral Proprioceptive Stimuli (OPS) induce Visual pseudo-Scotomas (VS) in the absence of other stimuli?
* Can Oral Proprioceptive Stimuli (OPS) modulate or eliminate Visual pseudo-Scotomas (VS) induced by auditory stimuli?

Researchers evaluated 38 healthy adults (aged 20-29) using the Vertical Maddox Test to detect functional visual alterations under different conditions. The study included four phases:

* Baseline assessment with no stimuli.
* Assessment with auditory stimuli alone.
* Assessment with simultaneous auditory and Oral Proprioceptive Stimuli (OPS), including tongue/lip positions (Combined Oral Stimuli) and dental pressure/traction stimuli (Dental Stimuli).
* Assessment with Oral Proprioceptive Stimuli (OPS) alone.

Visual pseudo-scotomas were recorded based on participant responses. The study was approved by the local ethics committee and all participants gave informed consent.

Conditions

• Proprioception
• Visual Perception
• Multisensory
• Stomatognathic System

Interventions

OTHER

Baseline Condition (No Stimuli)

Participants underwent baseline evaluation using the Vertical Maddox Test with no auditory or oral proprioceptive stimulation. This phase was used to confirm the absence of spontaneous visual pseudo-scotomas and served as an internal control condition for each participant.

OTHER

Auditory Stimulation only

Participants received bilateral auditory stimulation consisting of 500 Hz tones (500 ms duration, 50 dB) delivered through wireless headphones, without any accompanying oral stimuli. This condition was used to assess the isolated effect of sound on visual perception using the Vertical Maddox Test.

OTHER

Auditory and Oral Proprioceptive Stimulation (OPS)

Participants received simultaneous auditory and oral proprioceptive stimuli while undergoing the Vertical Maddox Test. - Auditory: 500 Hz tones (500 ms, 50 dB) via headphones. - Oral Proprioceptive Stimuli (OPS): included Combined Oral Stimuli (e.g., tongue and lip self-administered positions) and Dental Stimuli (mechanical pressure or traction on central incisors using a calibrated probe). This condition aimed to assess whether OPS could modulate or eliminate sound-induced visual pseudo-scotomas.

OTHER

Oral Proprioceptive Stimulation Only (OPS)

Participants received oral proprioceptive stimuli alone, without auditory input, during the Vertical Maddox Test. - Combined Oral Stimuli (COS): self-administered tongue/lip positions. - Dental Stimuli (DS): applied by the operator to central incisors. This condition was used to evaluate the independent effect of OPS on visual perception.

Sponsors & Collaborators

• Hospital Odontològic UB

  collaborator OTHER

• Sophie Román Richon

  lead OTHER

Eligibility

Min Age

18 Years

Sex

ALL

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2022-12-16

Primary Completion

2023-03-03

Completion

2023-03-03

Countries

• Spain

Study Locations