A differential effect of visual cortex tDCS on reading of English and Chinese in patients with central vision loss

Silva, Andrew E.; Lyu, Anqi; Leat, S.J.; Khan, Shamrozé; Labreche, Tammy; Chan, Jonathan C.H.; Li, Q.; Woo, G.C.; Woo, Stanley; Cheong, Allen M. Y.; Thompson, Benjamin

doi:10.1016/j.brs.2022.08.016

Cited by 8 publications

(31 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In agreement with our previous work in a group of patients with central vision loss 18 , active a-tDCS applied to the primary visual cortex did not significantly change Chinese reading performance in normal peripheral vision. While acknowledging the relatively small sample size of the current study which may restrict the generalizability of the results, this exploratory study offers insights into the field of non-invasive brain stimulation and its relationship with reading.…”

Section: Discussionsupporting

confidence: 92%

“…They found that 20 mins of a-tDCS tended to improve reading accuracy for English compared with sham stimulation. However, reading accuracy for Chinese did not change with a-tDCS 18 . The authors concluded that the effects of visual cortex a-tDCS on peripheral reading varied for different writing systems.…”

Section: Introductionmentioning

confidence: 78%

“…2,3,18 . Silva et al found that active a-tDCS increased reading accuracy in patients with macular degeneration who read English sentences presented word-by-word compared with sham stimulation, whereas such improvement was not shown in patients reading Chinese character-by-character18 . Furthermore, Chen et al compared the contrast threshold for recognizing either isolated English letters or letters flanked by 2 distractors appearing at 10 o eccentricity before and after…”

mentioning

confidence: 99%

See 2 more Smart Citations

Visual cortex anodal tDCS does not alter reading performance for Chinese presented character-by-character to normal peripheral vision

Lyu,

Silva,

Thompson

et al. 2023

Preprint

Self Cite

View full text Add to dashboard Cite

Visual cortex transcranial direct current stimulation (tDCS) reduces crowding in normal peripheral vision and may improve reading of English words in patients with macular degeneration. Given the different visual requirements of reading English words and Chinese characters, the effect of tDCS on peripheral reading performance in English might be different from Chinese. This study recruited seventeen participants (59 to 73 years of age) with normal vision and tested the hypothesis that anodal tDCS would improve reading of Chinese characters presented at 10° eccentricity compared with sham stimulation. Chinese sentences of different print sizes and exposure durations were presented one character at a time 10° below or to the left of fixation, and the individual critical print size (CPS) - the smallest print size eliciting the maximum reading speed (MRS) was determined. Reading accuracies for characters presented 0.2 logMAR smaller than the CPS were measured before, during, 5 mins, and 30 mins after receiving active or sham anodal visual cortex tDCS. Participants completed both the active and sham sessions in a random order following a double-blind, within-subject design. No effect of active anodal-tDCS on reading accuracy was observed, implying that a single session of tDCS did not improve Chinese character reading in normal peripheral vision. This may suggest that tDCS does not significantly reduce the crowding elicited within a single Chinese character. However, the effect of tDCS on between-character crowding is yet to be determined.

show abstract

Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 78%

mentioning

confidence: 99%

See 1 more Smart Citation

Visual cortex anodal tDCS does not alter reading performance for Chinese presented character-by-character to normal peripheral vision

Lyu,

Silva,

Thompson

et al. 2023

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…The current study found no effect of tDCS. However, Silva et al (2022) utilized a similar RSVP protocol and reported an effect with tDCS. The reason for a null tDCS effect in the current study is unclear.…”

Section: Discussionmentioning

confidence: 99%

“…One recent study examined the effect of visual cortex tDCS on reading in participants with central vision loss due to macular degeneration (Silva et al, 2022). To limit the impact of eye movements, sentences were presented on a computer screen using rapid serial visual presentation (RSVP) in which individual words were presented sequentially at specific presentation speeds and text sizes.…”

Section: Introductionmentioning

confidence: 99%

Improving peripheral reading with non-invasive transcranial electrical stimulation of early visual areas

Silva,

Mungalsingh,

Raudzus

et al. 2023

Preprint

Self Cite

View full text Add to dashboard Cite

We investigated the ability of two non-invasive transcranial electrical stimulation (tES) protocols targeting early visual areas to improve peripheral visual word recognition in separate within-subject, double-blind, sham-controlled experiments with normal observers. English sentences were presented 10 degrees below fixation using a rapid serial visual presentation (RSVP). Transcranial random noise stimulation (tRNS) applied bilaterally on either size of the occipital pole (Oz) elicited a significant performance benefit, but transcranial direct current stimulation (tDCS) applied to Oz did not. These results highlight important factors that may influence the effectiveness of non-invasive brain stimulation methods for enhancing peripheral processing of text, such as stimulation type. While more work is necessary to better understand the relationship between tES and peripheral reading, the present results contribute to the growing body of work implicating tES as a potential tool for enhancing peripheral visual processing.

show abstract

Non-invasive brain stimulation and vision rehabilitation: a clinical perspective

Park,

Thompson

2024

Clinical and Experimental Optometry

View full text Add to dashboard Cite

A differential effect of visual cortex tDCS on reading of English and Chinese in patients with central vision loss

Cited by 8 publications

References 10 publications

Visual cortex anodal tDCS does not alter reading performance for Chinese presented character-by-character to normal peripheral vision

Visual cortex anodal tDCS does not alter reading performance for Chinese presented character-by-character to normal peripheral vision

Improving peripheral reading with non-invasive transcranial electrical stimulation of early visual areas

Non-invasive brain stimulation and vision rehabilitation: a clinical perspective

Contact Info

Product

Resources

About