Psychology Magazine

Modulating Movement Intention and the Extended Present with tDCS.

By Deric Bownds @DericBownds

Douglas et al. do a fascinating bit of work on the 'extended present' in which our brains function, during which our experienced intention to make a movement actually comes ~200 milliseconds after motor cortex signals initiating the movement (the famous Libet experiment showing we are 'late to action'). Conscious intention, or volition, provides the foundation for our attributing agency to ourselves, and for society attributing responsibility to an individual. A distorted sense of volition is a hallmark of many neurological and psychiatric illnesses such as alien hand syndrome, psychogenic movement disorders, and schizophrenia.

Conscious intention is a fundamental aspect of the human experience. Despite long-standing interest in the basis and implications of intention, its underlying neurobiological mechanisms remain poorly understood. Using high-definition transcranial DC stimulation (tDCS), we observed that enhancing spontaneous neuronal excitability in both the angular gyrus and the primary motor cortex caused the reported time of conscious movement intention to be ∼60–70 ms earlier. Slow brain waves recorded ∼2–3 s before movement onset, as well as hundreds of milliseconds after movement onset, independently correlated with the modulation of conscious intention by brain stimulation. These brain activities together accounted for 81% of interindividual variability in the modulation of movement intention by brain stimulation. A computational model using coupled leaky integrator units with biophysically plausible assumptions about the effect of tDCS captured the effects of stimulation on both neural activity and behavior. These results reveal a temporally extended brain process underlying conscious movement intention that spans seconds around movement commencement.

You Might Also Like :

Back to Featured Articles on Logo Paperblog

These articles might interest you :

  • Indulgeo Essentials Rose Gold Oil Vs TS Cosmetics 24K Gold Elixir

    Indulgeo Essentials Rose Gold Cosmetics Elixir

    | REVIEW COMPARISON Hello my lovely people out there !!! So after a long wait, I am finally sitting down to review and compare the two most famous gold... Read more

    10 hours, 35 minutes ago by   Khadija Beauty
    HAIR & BEAUTY, LIFESTYLE
  • Here We Go Again!

    Here Again!

    Despite a not-so-good garden last year (deer, bunnies, blight, and bugs,) I found myself at it again yesterday, setting out parsley and thyme, kale and... Read more

    16 hours, 17 minutes ago by   Vickilane
    CREATIVITY, PHOTOGRAPHY
  • Pain Perdu with Clotted Cream & Berries

    Pain Perdu with Clotted Cream Berries

    I really love simple things . . . time and time again, I am reminded that it is the simple things in life which truly are the best . . . Read more

    19 hours, 17 minutes ago by   Mariealicerayner
    FOOD & DRINK, RECIPES
  • Oscar Wilde - His Part In My Downfall

    Oscar Wilde Part Downfall

    If I've piqued your interest with the title of today's blog then we're off to a promising start. To be earnest with you (which is important, is it not? Read more

    22 hours, 37 minutes ago by   Ashleylister
    BOOKS, CREATIVITY, CULTURE, SELF EXPRESSION
  • Jobs in Sri Lanka – Guide for Work

    Jobs Lanka Guide Work

    Hotel Jobs in Sri Lanka Hotel jobs in Sri Lanka with Dubai City Company. We are now helping to get employment in Sri Lanka. We are now working with several... Read more

    The 21 April 2018 by   Dubai City Company
    CAREER
  • Beautiful Whirlwind

    Beautiful Whirlwind

    It's crazy how so much can change in a week. Last weekend I was busy shoveling two feet of snow during a rare spring blizzard while trying to get acquainted wit... Read more

    The 21 April 2018 by   Hikingwithheather
    OUTDOORS, TREK
  • World Borders: Muslims Only – The Fork in the Road Near Mecca, Saudi Arabia

    World Borders: Muslims Only Fork Road Near Mecca, Saudi Arabia

    This is a world border which is slightly different to those in my normal World Borders series, as whether you enter this border or not depends solely on one... Read more

    The 21 April 2018 by   Jsbdsl
    DESTINATIONS, TRAVEL

Magazines