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IR Frequency Region: Fingerprint Region

IR Frequency Region: Fingerprint Region

IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
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Related Experiment Video

Updated: Jun 30, 2026

Author Spotlight: Unlocking New Insights in fNIRS Studies - A Novel Framework for Inter-Brain Synchrony Analysis

Author Spotlight: Unlocking New Insights in fNIRS Studies - A Novel Framework for Inter-Brain Synchrony Analysis

Published on: October 6, 2023

An Exploratory Functional Near-infrared Spectroscopy Study of Prefrontal Cortex Connectivity during Body Scan

Seungho Kim¹, Jihyun Nam², Sang Won Lee^3,4

¹Institute of Biomedical Engineering Research, Kyungpook National University, Daegu, Korea.

Clinical Psychopharmacology and Neuroscience : the Official Scientific Journal of the Korean College of Neuropsychopharmacology

|October 26, 2025

Summary

Body scan meditation shows potential for mental health benefits by enhancing prefrontal network connectivity. This mindfulness practice was linked to reduced depressive and anxiety symptoms in healthy adults.

Keywords:

Dorsolateral prefrontal cortex Functional near-infrared spectroscopy Meditation

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Published on: June 24, 2025

Area of Science:

Neuroscience
Psychology
Mindfulness Research

Background:

Body scan meditation involves focusing on bodily sensations, a practice studied for its neural underpinnings.
Functional magnetic resonance imaging (fMRI) has been used, but functional near-infrared spectroscopy (fNIRS) offers direct measurement of prefrontal networks during meditation.

Purpose of the Study:

To investigate prefrontal network activity using fNIRS during body scan meditation.
To explore the relationship between prefrontal network connectivity and mental health symptoms.

Main Methods:

40 healthy young adults without prior meditation experience participated.
fNIRS measured prefrontal network activity during body scan meditation and resting with nature sounds.
Depression, anxiety symptoms, and emotion regulation were assessed.

Main Results:

Significant positive prefrontal network connectivity was observed in both conditions.
Resting with nature sounds showed greater dorsolateral and medial prefrontal cortex connectivity than body scan meditation.
Body scan meditation connectivity (left superior frontal gyrus-right medial superior frontal gyrus) negatively correlated with depression/anxiety and positively with emotion regulation.

Conclusions:

Enhanced prefrontal networks through meditation may offer therapeutic benefits for mental health.
fNIRS provides direct neural correlates of body scan meditation, aiding understanding of its mechanisms.