Neuroplasticity in adult human visual cortex

Elisa Castaldi, Claudia Lunghi, Maria Concetta Morrone

Research output: Contribution to journalReview article

Abstract

Between 1-5:100 people worldwide have never experienced normotypic vision due to a condition called amblyopia, and about 1:4000 suffer from inherited retinal dystrophies that progressively lead to blindness. While a wide range of technologies and therapies are being developed to restore vision, a fundamental question still remains unanswered: would the adult visual brain retain a sufficient plastic potential to learn how to ‘see’ after a prolonged period of abnormal visual experience? In this review we summarize studies showing that the visual brain of sighted adults retains a type of developmental plasticity, called homeostatic plasticity, and this property has been recently exploited successfully for adult amblyopia recovery. Next, we discuss how the brain circuits reorganize when blindness occurs and when visual stimulation is partially restored by means of a ‘bionic eye’ in late blind adults with Retinitis Pigmentosa. The primary visual cortex in these patients slowly became activated by the artificial visual stimulation, indicating that sight restoration therapies can rely on a considerable degree of spared plasticity in adulthood.

Original languageEnglish
Pages (from-to)542-552
Number of pages11
JournalNeuroscience and Biobehavioral Reviews
Volume112
DOIs
Publication statusPublished - May 2020

Keywords

  • 7T fMRI
  • Amblyopia
  • Binocular rivalry
  • Bionic eye
  • Blindness
  • Cortical excitability
  • Critical period
  • Cross-modal plasticity
  • Retinal prosthesis
  • Retinitis pigmentosa
  • Short-term monocular deprivation
  • Visual restoration

ASJC Scopus subject areas

  • Neuropsychology and Physiological Psychology
  • Cognitive Neuroscience
  • Behavioral Neuroscience

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