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Experimental manipulation of head posture.

P S Vig, K J Showfety, C Phillips

American Journal of Orthodontics

|March 1, 1980

Summary

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Total nasal obstruction causes an extended head posture. Visual deprivation has a minor, unpredictable effect, with nasal obstruction dominating when both conditions are combined, impacting head posture.

Area of Science:

Craniofacial morphology
Human posture
Respiratory physiology

Background:

Natural head position is linked to dentoalveolar and craniofacial skeletal features.
The underlying factors influencing cranial posture remain largely unknown.
Understanding head posture determinants is crucial for craniofacial research.

Purpose of the Study:

To investigate the influence of experimental conditions on cranial posture.
To determine the effects of total nasal obstruction and visual feedback deprivation on head position.
To assess the combined impact and relative dominance of these factors on posture.

Main Methods:

Three experimental conditions were tested: total nasal obstruction, visual feedback deprivation, and a combination of both.

Related Experiment Videos

Cranial posture was measured against a gravity-defined true vertical reference plane.

The study analyzed postural adaptations in response to respiratory and visual stimuli.

Main Results:

Total nasal obstruction consistently led to an extended head position in all subjects.
Visual feedback deprivation resulted in adaptations of smaller magnitude and unpredictable direction.
When both nasal obstruction and visual deprivation were combined, respiratory adaptation dominated the postural response.

Conclusions:

Total nasal obstruction is a significant determinant of cranial posture, inducing an extended head position.
Visual feedback plays a lesser, less predictable role in head posture adaptation compared to nasal obstruction.
Respiratory influences, specifically nasal obstruction, appear to be dominant in modulating head posture under combined stimuli.