Waves of awareness for occipital and parietal phosphenes perception

Chiara Bagattini, Chiara Mazzi, Silvia Savazzi

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Transcranial magnetic stimulation (TMS) of the occipital cortex is known to induce visual sensations, i.e. phosphenes, which appear as flashes of light in the absence of an external stimulus. Recent studies have shown that TMS can produce phosphenes also when the intraparietal sulcus (IPS) is stimulated. The main question addressed in this paper is whether parietal phosphenes are generated directly by local mechanisms or emerge through indirect activation of other visual areas. Electroencephalographic (EEG) signals were recorded while stimulating left occipital or parietal cortices inducing phosphene perception in healthy participants and in a hemianopic patient who suffered from complete destruction of the early visual cortex of the left hemisphere. Results in healthy participants showed that the onset of phosphene perception induced by occipital TMS correlated with differential cortical activity in temporal sites while the onset of phosphene perception induced by parietal TMS correlated with differential cortical activity in the stimulated parietal site. Moreover, IPS-TMS of the lesioned hemisphere of the hemianopic patient with a complete lesion to V1 showed again that the onset of phosphene perception correlated with differential cortical activity in the stimulated parietal site. The present data seem thus to suggest that temporal and parietal cortices can serve as different local early gatekeepers of perceptual awareness and that activity in the occipital cortex, although being relevant for perception in general, is not part of the neural bases of the perceptual awareness of phosphenes.

Original languageEnglish
Pages (from-to)114-125
Number of pages12
JournalNeuropsychologia
Volume70
DOIs
Publication statusPublished - Apr 1 2015

Fingerprint

Phosphenes
Transcranial Magnetic Stimulation
Parietal Lobe
Occipital Lobe
Healthy Volunteers
Parietal
Waves
Visual Cortex
Temporal Lobe
Cortex
Onset
Light

Keywords

  • Dorsal stream
  • EEG
  • Primary visual cortex
  • TMS-evoked potentials
  • Ventral stream

ASJC Scopus subject areas

  • Behavioral Neuroscience
  • Cognitive Neuroscience
  • Experimental and Cognitive Psychology
  • Arts and Humanities (miscellaneous)
  • Medicine(all)

Cite this

Waves of awareness for occipital and parietal phosphenes perception. / Bagattini, Chiara; Mazzi, Chiara; Savazzi, Silvia.

In: Neuropsychologia, Vol. 70, 01.04.2015, p. 114-125.

Research output: Contribution to journalArticle

Bagattini, Chiara ; Mazzi, Chiara ; Savazzi, Silvia. / Waves of awareness for occipital and parietal phosphenes perception. In: Neuropsychologia. 2015 ; Vol. 70. pp. 114-125.
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