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Related Experiment Video

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Transcranial Magnetic Stimulation for Investigating Causal Brain-behavioral Relationships and their Time Course
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Feedforward and quick recurrent processes in early visual cortex revealed by TMS?

Tom A de Graaf1, Rainer Goebel, Alexander T Sack

  • 1Department of Cognitive Neuroscience, Faculty of Psychology and Neuroscience, Maastricht University, Maastricht, The Netherlands. tom.degraaf@maastrichtuniversity.nl

Neuroimage
|October 29, 2011
PubMed
Summary
This summary is machine-generated.

Transcranial magnetic stimulation (TMS) reveals distinct visual processing timings. Early visual processing (orientation) is faster than complex stimuli (faces), suggesting feedforward and recurrent processing within a single masking window.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Transcranial magnetic stimulation (TMS) applied to the occipital cortex can disrupt conscious visual perception.
  • Previous TMS research identified a 'classical' masking window around 100ms post-stimulus, but its underlying visual processing (feedforward vs. feedback) remains debated.

Purpose of the Study:

  • To investigate the nature of visual processing within the classical TMS masking window.
  • To differentiate between feedforward and recurrent processing contributions to visual awareness.

Main Methods:

  • Used TMS to mask visual stimuli (orientation gratings and faces) of varying complexity at different time windows.
  • Employed a follow-up experiment with superimposed stimuli and task-based discrimination (orientation vs. face) to equate difficulty and isolate processing stages.

Main Results:

  • Masking functions differed for orientation stimuli (earlier peak latency) and faces (slower recovery).
  • When task difficulty was equated, peak masking latency was similar, but face discrimination still showed slower recovery, indicating recurrent processing.

Conclusions:

  • The classical TMS masking window likely encompasses both feedforward (early) and recurrent (later) visual processing stages.
  • Findings challenge a simple feedforward or feedback dichotomy, supporting more complex recurrent models of visual perception and awareness.