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Related Concept Videos

The Tongue and Taste Buds00:49

The Tongue and Taste Buds

The surface of the tongue is covered with various small bumps called papillae, which either distribute what has been ingested (filiform papillae) or contain the sensory taste (or gustatory) receptor cells (fungiform, circumvallate, and foliate papillae). Embedded within each taste-related papilla are the taste buds—clusters of 30 to 100 gustatory receptor cells.
Assessment of the Mouth01:26

Assessment of the Mouth

A thorough mouth assessment, including inspection and palpation of the lips, gums, tongue, tonsils, uvula, and pharynx, is crucial in detecting potential health issues. Diseases ranging from oral cancer to systemic conditions like diabetes could be identified early through careful oral examination. This article provides a detailed guide on conducting a comprehensive mouth assessment.
Mouth Inspection
The inspection begins with visually examining the mouth for symmetry, color, and size.
Tongue01:01

Tongue

The human tongue is a fascinating and complex organ, responsible for various essential functions such as swallowing, speech, and taste. It is also subject to various conditions and diseases. In this article, we delve into the anatomy of the tongue, its roles, and some common conditions that can affect it.
Anatomical Position in the Oral Cavity
The tongue is located within the oral cavity, also known as the mouth. It is attached to the floor of the mouth by a fold of mucous membrane called the...
Aliasing01:18

Aliasing

Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original signal...
Discrete Fourier Transform01:15

Discrete Fourier Transform

The Discrete Fourier Transform (DFT) is a fundamental tool in signal processing, extending the discrete-time Fourier transform by evaluating discrete signals at uniformly spaced frequency intervals. This transformation converts a finite sequence of time-domain samples into frequency components, each representing complex sinusoids ordered by frequency. The DFT translates these sequences into the frequency domain, effectively indicating the magnitude and phase of each frequency component present...
Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear.

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Related Experiment Video

Updated: Jun 23, 2026

Objectification of Tongue Diagnosis in Traditional Medicine, Data Analysis, and Study Application
05:56

Objectification of Tongue Diagnosis in Traditional Medicine, Data Analysis, and Study Application

Published on: April 14, 2023

[Tongue manifestation based on spectral method].

Ling Lin1, Xin Xie, Gang Li

  • 1State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China.

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|May 22, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a novel spectral method for objectively assessing tongue physiology and pathology. The technique provides more accurate health insights than traditional methods, aiding in Traditional Chinese Medicine research.

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Last Updated: Jun 23, 2026

Objectification of Tongue Diagnosis in Traditional Medicine, Data Analysis, and Study Application
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08:32

Ultrasound Images of the Tongue: A Tutorial for Assessment and Remediation of Speech Sound Errors

Published on: January 3, 2017

Area of Science:

  • Biomedical Optics
  • Spectroscopy
  • Diagnostic Technology

Context:

  • Objective assessment of physiological and pathological tongue changes is crucial for diagnostics.
  • Traditional methods for tongue analysis lack objectivity and precision.
  • Advancements in spectral analysis offer potential for improved diagnostic capabilities.

Purpose:

  • To investigate a spectrum-based method for objective tongue description.
  • To normalize reflectance spectrum measurements according to International Commission on Illumination (CIE) standards.
  • To extract detailed physiological and pathological information from tongue spectral data.

Summary:

  • A novel spectral method measures and normalizes tongue reflectance spectra under standardized lighting.
  • This technique precisely captures tongue color and acquires parameters related to microstructure, composition, and microcirculation.
  • Preliminary experiments demonstrate the method's ability to detect subtle tongue differences and changes.

Impact:

  • Provides more effective and accurate information compared to traditional tongue assessment methods.
  • Enables the characterization of physiological and pathological tongue alterations.
  • Facilitates the integration of spectral data with physical references to advance Traditional Chinese Medicine (TCM) research.