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Related Concept Videos

Attention-Deficit/Hyperactivity Disorder01:30

Attention-Deficit/Hyperactivity Disorder

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Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by persistent inattention, hyperactivity, and impulsivity. It affects approximately 5-8% of children globally, with around 60-70% of cases persisting into adulthood. ADHD has significant implications for educational attainment, social interactions, and occupational success.
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Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
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No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Schemas01:42

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Related Experiment Video

Updated: Feb 5, 2026

Event Related Potentials ERPs and other EEG Based Methods for Extracting Biomarkers of Brain Dysfunction: Examples from Pediatric Attention Deficit/Hyperactivity Disorder ADHD
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Event Segmentation Deficits in ADHD.

Julia Ryan1, Maria Rogers1

  • 1University of Ottawa, Ontario, Canada.

Journal of Attention Disorders
|September 13, 2018
PubMed
Summary

Individuals with Attention-Deficit/Hyperactivity Disorder (ADHD) show significant event segmentation deficits, identifying more large events than their peers. This suggests underlying issues in how they process and update information.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Clinical Psychology

Background:

  • Event segmentation is a fundamental cognitive process for organizing continuous information into meaningful units.
  • Event segmentation theory (EST) highlights its role in attention and action control.
  • Neurocognitive deficits in Attention-Deficit/Hyperactivity Disorder (ADHD) overlap with known event segmentation mechanisms, yet this link remains unexplored.

Purpose of the Study:

  • To investigate and document event segmentation deficits in individuals diagnosed with ADHD.
  • To establish a clearer understanding of how ADHD impacts the ability to segment ongoing experiences.

Main Methods:

  • A cohort of 75 undergraduates with ADHD and 79 without ADHD completed a standardized event segmentation task.
Keywords:
ADHDcognitionperception

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  • Performance was analyzed to identify differences in how participants chunked information into events.

    • Main Results:

    • Undergraduates with ADHD demonstrated a significant tendency to identify larger, broader events compared to the control group.
    • This suggests a difference in the granularity of event perception in individuals with ADHD.

    Conclusions:

    • The findings indicate potential disturbances in the event model and updating systems within the cognitive architecture of individuals with ADHD.
    • Further research is warranted to explore these deficits with diverse stimuli and link them to functional impairments.