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Related Concept Videos

Higher Mental Functions of the Brain: Language01:10

Higher Mental Functions of the Brain: Language

Language is a system of communication that allows the expression of thoughts, ideas, and feelings. The brain processes language in both hemispheres.
Language formation and comprehension take place in the dominant hemisphere. The dominant hemisphere is responsible for understanding the meaning of spoken, written, or sign language, as well as the ability to communicate. For most people, the left hemisphere is the dominant one. The right hemisphere, then, gives tone and emotional context to the...
ortho–para-Directing Deactivators: Halogens01:24

ortho–para-Directing Deactivators: Halogens

Halogens are ortho–para directors. They are more electronegative than carbon. Therefore, as ring substituents, they can withdraw electrons through the inductive effect and deactivate the aromatic ring towards electrophilic substitution. Halogens also have an electron-donating resonance effect on the ring, which influences the orientation of the incoming electrophile. If an electrophile attacks at the ortho or the para position, the halogen donates electrons and stabilizes the intermediate...
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
Mass Spectrometry: Alkyne Fragmentation00:53

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The fragmentation of alkynes preferentially occurs at the carbon–carbon bond between the α and β carbon of the alkyne bond to generate a 3-propynyl cation (or propargyl cation). In terminal alkynes, there is the only type of fragmentation that yields the 3-propynyl cation. The unsubstituted 3-propynyl cation exhibits a peak at a mass-to-charge ratio of 39. In internal alkynes, the 3-propynyl cation is substituted. For example, 2-pentyne fragments into methyl-substituted 3-propynyl cation, which...
Mass Spectrometry: Branched Alkane Fragmentation01:29

Mass Spectrometry: Branched Alkane Fragmentation

This lesson delves into the mass spectrometry of branched alkane fragmentation. Branched alkanes possess secondary or tertiary carbon atoms, which generate relatively stable carbocations if the cleavage occurs at the branching point. The high stability of carbocations drives the instant fragmentation of branched alkanes. Accordingly, the branched alkane's molecular ion peak is very weak or invisible in the mass spectra, especially in comparison to a linear alkane.
Mass Spectrometry: Molecular Fragmentation Overview01:20

Mass Spectrometry: Molecular Fragmentation Overview

The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
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Related Experiment Video

Updated: May 18, 2026

Foreign Accent and Forensic Speaker Identification in Voice Lineups: The Influence of Acoustic Features Based on Prosody
09:09

Foreign Accent and Forensic Speaker Identification in Voice Lineups: The Influence of Acoustic Features Based on Prosody

Published on: September 27, 2024

Alpha activity marking word boundaries mediates speech segmentation.

Antoine J Shahin1, Mark A Pitt

  • 1Department of Otolaryngology-Head and Neck Surgery, The Ohio State University, Columbus, OH, USA. tonyshahin@gmail.com

The European Journal of Neuroscience
|October 2, 2012
PubMed
Summary
This summary is machine-generated.

Researchers found that specific brainwave patterns, namely alpha and beta activity, help us distinguish words in continuous speech. This neurophysiological process, called speech segmentation, is crucial for understanding spoken language.

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Examining Online Syntactic Processing of Spoken Complex Sentences in Chinese Using Dual-Modal Interference Tasks
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Related Experiment Videos

Last Updated: May 18, 2026

Foreign Accent and Forensic Speaker Identification in Voice Lineups: The Influence of Acoustic Features Based on Prosody
09:09

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Published on: September 27, 2024

Examining Online Syntactic Processing of Spoken Complex Sentences in Chinese Using Dual-Modal Interference Tasks
08:32

Examining Online Syntactic Processing of Spoken Complex Sentences in Chinese Using Dual-Modal Interference Tasks

Published on: September 5, 2019

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psycholinguistics

Background:

  • Continuous speech presents challenges for word segmentation due to acoustic ambiguities.
  • Listeners can perceive ambiguous speech sequences as either single units or distinct words.

Purpose of the Study:

  • To investigate the neurophysiological mechanisms underlying speech segmentation.
  • To identify brain activity patterns associated with successful and failed word segmentation.

Main Methods:

  • Electroencephalography (EEG) was used to record brain activity in participants listening to word and non-word sequences.
  • Participants reported whether they perceived the sequences as one word or two words.

Main Results:

  • Fronto-central alpha activity (9-14 Hz) correlated with speech segmentation, indicating the inhibition of irrelevant neural processes at word boundaries.
  • Left-lateralized beta activity (14-18 Hz) differentiated between word and non-word segmentation.
  • Alpha activity appears to mark word boundaries, facilitating segmentation.

Conclusions:

  • Neural disengagement, reflected by alpha activity, plays a key role in identifying word boundaries in continuous speech.
  • Beta activity may support the integration of word representations into coherent phrases.
  • These findings elucidate the brain's mechanisms for parsing spoken language.