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Related Concept Videos

Directing Effect of Substituents: ortho–para-Directing Groups01:14

Directing Effect of Substituents: ortho–para-Directing Groups

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Ortho–para directors are substituent groups attached to the benzene ring and direct the addition of an electrophile to the positions ortho or para to the substituent. All electron-donating groups are considered ortho–para directors. They donate electrons to the ring and make the ring more electron-rich. The ring is therefore susceptible to the addition of electrophiles. Substituents such as amino, hydroxy, or alkoxy, containing lone pairs on the atom adjacent to the ring, donate...
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ortho–para-Directing Deactivators: Halogens01:24

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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...
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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

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

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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...
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Social Facilitation

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Not all intergroup interactions lead to negative outcomes. Sometimes, being in a group situation can improve performance. Social facilitation occurs when an individual performs better when an audience is watching than when the individual performs the behavior alone. This typically occurs when people are performing a task for which they are skilled.
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Cause and Effect01:53

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While variables are sometimes correlated because one does cause the other, it could also be that some other factor, a confounding variable, is actually causing the systematic movement in our variables of interest. For instance, as sales in ice cream increase, so does the overall rate of crime. Is it possible that indulging in your favorite flavor of ice cream could send you on a crime spree? Or, after committing crime do you think you might decide to treat yourself to a cone?
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Updated: Feb 12, 2026

Vision Training Methods for Sports Concussion Mitigation and Management
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Vision Training Methods for Sports Concussion Mitigation and Management

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Concussion in Para Sport.

James Kissick1, Nick Webborn2

  • 1Department of Family Medicine, University of Ottawa Carleton University Sport Medicine Clinic, Ottawa, Ontario, Canada.

Physical Medicine and Rehabilitation Clinics of North America
|April 9, 2018
PubMed
Summary
This summary is machine-generated.

Para athletes face concussion risks similar to able-bodied athletes, but research on concussion incidence in para sport is limited. Current guidelines may not suit para-athletes, highlighting a need for further investigation.

Keywords:
Athletes with a disabilityConcussionInjuryPara athletePara sport

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Area of Science:

  • Sports Medicine
  • Neurology
  • Disability Studies

Background:

  • Para athletes (Paralympic athletes) experience concussion risks comparable to able-bodied athletes.
  • There is a significant gap in research regarding the incidence and characteristics of concussion in para sport.
  • Current concussion assessment and management tools, developed for the general population, may not be suitable for para-athletes.

Purpose of the Study:

  • To review the current knowledge on concussion in para sport.
  • To identify challenges in concussion research and management for para-athletes.
  • To highlight opportunities for advancing understanding and care in this area.

Main Methods:

  • Literature review of existing studies on concussion in para sport.
  • Analysis of the applicability of current general concussion guidelines to para-athletes.
  • Identification of research gaps and future directions.

Main Results:

  • Limited research exists on concussion incidence and outcomes in para sport.
  • Existing diagnostic and management protocols may require adaptation for specific para-athlete populations.
  • Significant challenges include the heterogeneity of impairments and lack of sport-specific data.

Conclusions:

  • Concussion in para sport is under-researched, necessitating tailored approaches.
  • Further research is crucial to develop appropriate assessment and management strategies for para-athletes.
  • Addressing these knowledge gaps will improve the safety and well-being of para athletes.