Alpha-band suppression in the visual word form area as a functional bottleneck to consciousness

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Alpha-band suppression in the visual word form area as a functional bottleneck to consciousness
Authors: Jonathan Levy, Juan R. Vidal, Robert Oostenveld, Ian FitzPatrick, Jean-Francois Démonet, Pascal Fries
Citation: NeuroImage 78 : 33-45. 2013 September
Database(s): Google Scholar cites PubMed (PMID/23591074)
DOI: 10.1016/j.neuroimage.2013.04.020.
Link(s): http://hal.inria.fr/docs/00/81/96/67/PDF/Levy_et_al.pdf
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Alpha-band suppression in the visual word form area as a functional bottleneck to consciousness is magnetoencephalography with words presents in a way to they are sometimes consciously percepted.

Special attention is paid to the visual word form area.

[edit] Method

One trial:

  1. Pause 2600-2933.33 ms
  2. Fixation crosshair: 600-933.33 ms
  3. Forward mask (66.66 ms)
  4. A word (33.33 ms) (or black in the sixth of the trials)
  5. Backward mask (66.66 ms)
  6. Fixation crosshair with prompt for respons (no longer than 2100 ms)

Contrasting trials with percept of words versus no percept of word.

[edit] Results

  1. Alpha suppression in alpha band around 10 Hz around 0.5 after stimulus.
  2. Suppression in beta band (15-30 Hz) at the same time.
  3. Increased activity in the gamma band particularly around 70 Hz after the stimulus (0.1-0.4 and 0.55-1+)
  4. Alpha-band suppression peaking in left occipito-temporal cortical junction.

[edit] Related papers

  1. The visual word form area: spatial and temporal characterization of an initial stage of reading in normal subjects and posterior split-brain patients
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