The Role of the Anterior Temporal Lobe in Reading: An HD-tDCS Study.
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- [1] § METHODS › Analysis ↔ PicturePlausibility_code.qmd, lines 260–337 · score 0.85 · log transformed, residual SD, brms, Picture Plausibility, Student, chains
Paper
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The authors' code
Quarto · 403 lines · 10 KB · no license · 1 match
- ---
- title: "PP tDCS 1 & 2"
- format: html
- editor: visual
- ---
- # Combining data
- ```{r}
- library(patchwork)
- library(readxl)
- library(ggplot2)
- library(gridExtra)
- library(openxlsx)
- library(dplyr)
- library(corrplot)
- library(prettyR)
- library(hrbrthemes)
- library(lme4)
- library(lmerTest)
- library(tidyverse)
- library(rstan)
- library(brms)
- library(bridgesampling)
- library(bayestestR)
- library(tidyverse)
- data <- read_excel("/Users/sophie.arheix/Desktop/Studies/2.tDCS1&2_WN/DATA/PP_repository.xlsx")
- ```
- Cleaning data (subjects, outliers + wrong answer
- ```{r}
- data_clean <- subset(data, RT != 0,)
- #Excluding upper limits
- data_median <- median(data_clean$RT)
- data_clean <- subset(data_clean, RT < 2000)
- data_clean <- subset(data_clean, RT > 400)
- #outliers
- remove_outliers <- function(data_clean, sd_threshold = 3) {
- result <- data.frame()
- subjects <- unique(data_clean$Subject)
- for (subject in subjects) {
- subset_df <- data_clean[data_clean$Subject == subject, ]
- mean_rt <- mean(subset_df$RT)
- sd_rt <- sd(subset_df$RT)
- subset_df <- subset_df[abs(subset_df$RT - mean_rt) <= sd_threshold * sd_rt, ]
- result <- rbind(result, subset_df)
- }
- return(result)
- }
- data_clean <- remove_outliers(data_clean)
- #Accuracy
- accuracy<-data_clean
- data_clean <- filter (data_clean, (Accuracy !=0 ))
- ```
- ### Summarize function
- ```{r}
- ## Summarizes data.
- ## Gives count, mean, standard deviation, standard error of the mean, and confidence interval (default 95%).
- ## data: a data frame.
- ## measurevar: the name of a column that contains the variable to be summariezed
- ## groupvars: a vector containing names of columns that contain grouping variables
- ## na.rm: a boolean that indicates whether to ignore NA's
- ## conf.interval: the percent range of the confidence interval (default is 95%)
- summarySE <- function(data=NULL, measurevar, groupvars=NULL, na.rm=FALSE, conf.interval=.95, .drop=TRUE) {
- require(plyr)
- # New version of length which can handle NA's: if na.rm==T, don't count them
- length2 <- function (x, na.rm=FALSE) {
- if (na.rm) sum(!is.na(x))
- else length(x)
- }
- # This is does the summary; it's not easy to understand...
- datac <- ddply(data, groupvars, .drop=.drop,
- .fun= function(xx, col, na.rm) {
- c( N = length2(xx[,col], na.rm=na.rm),
- mean = mean (xx[,col], na.rm=na.rm),
- sd = sd (xx[,col], na.rm=na.rm)
- )
- },
- measurevar,
- na.rm
- )
- # Rename the "mean" column
- datac <- plyr::rename(datac, c("mean"=measurevar))
- datac$se <- datac$sd / sqrt(datac$N) # Calculate standard error of the mean
- # Confidence interval multiplier for standard error
- # Calculate t-statistic for confidence interval:
- # e.g., if conf.interval is .95, use .975 (above/below), and use df=N-1
- ciMult <- qt(conf.interval/2 + .5, datac$N-1)
- datac$ci <- datac$se * ciMult
- return(datac)
- }
- ```
- ### Subsets
- ```{r}
- #subsets
- ATL_2 <- subset(data_clean, Target=="ATL")
- TOC_2 <- subset(data_clean, Target=="TOC")
- ATL_accuracy <- subset(accuracy, Target=="ATL")
- TOC_accuracy <- subset(accuracy, Target=="TOC")
- ```
- # Visualization
- ## Main effect
- ```{r}
- #TOC
- RT_4 <- summarySE(data=TOC_2, measurevar="RT", groupvars=c("Stimulation", "cond"))
- ggplot(RT_4, aes(x = cond, y =RT, fill = Stimulation)) +
- geom_bar(stat = "identity", position = "dodge") +
- geom_errorbar(width = 0.15, position = position_dodge(1), aes(ymin = RT - se, ymax = RT + se)) +
- scale_y_continuous("Mean RT") +
- xlab("Stimulation type") +
- scale_fill_manual(values = c("Real" = "darkgoldenrod1", "Sham" = "cyan4")) +
- coord_cartesian(ylim = c(600, 1200)) + labs(title="TOC Stimulation")
- #ATL
- RT_5 <- summarySE(data=ATL_2, measurevar="RT", groupvars=c("Stimulation", "cond"))
- ggplot(RT_5, aes(x = cond, y =RT, fill = Stimulation)) +
- geom_bar(stat = "identity", position = "dodge") +
- geom_errorbar(width = 0.15, position = position_dodge(1), aes(ymin = RT - se, ymax = RT + se)) +
- scale_y_continuous("Mean RT") +
- xlab("Stimulation type") +
- scale_fill_manual(values = c("Real" = "darkgoldenrod1", "Sham" = "cyan4")) +
- coord_cartesian(ylim = c(600, 1200)) + labs(title="ATL Stimulation")
- #####Accuracy
- RT_6 <- summarySE(data=TOC_accuracy, measurevar="Accuracy", groupvars=c("Stimulation", "cond"))
- ggplot(RT_6, aes(x = cond, y =Accuracy, fill = Stimulation)) +
- geom_bar(stat = "identity", position = "dodge") +
- geom_errorbar(width = 0.15, position = position_dodge(1), aes(ymin = Accuracy - se, ymax = Accuracy + se)) +
- scale_y_continuous("Mean Accuracy") +
- xlab("Stimulation type") +
- scale_fill_manual(values = c("Real" = "darkgoldenrod1", "Sham" = "cyan4")) +
- coord_cartesian(ylim = c(0.6, 1)) + labs(title ="TOC Stimulation")
- RT_7 <- summarySE(data=ATL_accuracy, measurevar="Accuracy", groupvars=c("Stimulation", "cond"))
- ggplot(RT_7, aes(x = cond, y =Accuracy, fill = Stimulation)) +
- geom_bar(stat = "identity", position = "dodge") +
- geom_errorbar(width = 0.15, position = position_dodge(1), aes(ymin = Accuracy - se, ymax = Accuracy + se)) +
- scale_y_continuous("Mean Accuracy") +
- xlab("Stimulation type") +
- scale_fill_manual(values = c("Real" = "darkgoldenrod1", "Sham" = "cyan4")) +
- coord_cartesian(ylim = c(0.6, 1)) + labs(title="ATL Stimulation")
- ```
- # Omnibus model
- ## RT
- ```{r}
- print("#################### ATL ###########################")
- ATL_2 <- subset(data_clean, Target=="ATL")
- ATL_plaus <- subset(ATL_2, cond == "plausible")
- ATL_implaus <- subset(ATL_2, cond == "implaus")
- omnibus_model <- lmer(RT ~ cond + Stimulation + (1|Subject), data=ATL_2)
- summary(omnibus_model)
- condition <- lmer(RT ~ Stimulation + (1|Subject), data=ATL_plaus)
- summary(condition)
- condition <- lmer(RT ~ Stimulation + (1|Subject), data=ATL_implaus)
- summary(condition)
- print("#################### TOC ###########################")
- TOC_2 <- subset(data_clean, Target=="TOC")
- TOC_plaus <- subset(TOC_2, cond == "plausible")
- TOC_implaus <- subset(TOC_2, cond == "implaus")
- omnibus_model <- lmer(RT ~ cond + Stimulation + (1|Subject), data=TOC_2)
- summary(omnibus_model)
- condition <- lmer(RT ~ Stimulation + (1|Subject), data=TOC_plaus)
- summary(condition)
- condition <- lmer(RT ~ Stimulation + (1|Subject), data=TOC_implaus)
- summary(condition)
- ```
- ## Accuracy
- ```{r}
- #################### ATL ###########################
- ATL_2 <- subset(accuracy, Target=="ATL")
- ATL_plaus <- subset(ATL_2, cond == "plausible")
- ATL_implaus <- subset(ATL_2, cond == "implaus")
- omnibus_model <- glmer(Accuracy ~ cond + Stimulation + (1|Subject), data=ATL_2, family=binomial())
- summary(omnibus_model)
- condition <- glmer(Accuracy ~ Stimulation + (1|Subject), data=ATL_plaus, family=binomial())
- summary(condition)
- condition <- glmer(Accuracy ~ Stimulation + (1|Subject), data=ATL_implaus, family=binomial())
- summary(condition)
- #################### TOC ###########################
- TOC_2 <- subset(accuracy, Target=="TOC")
- TOC_plaus <- subset(TOC_2, cond == "plausible")
- TOC_implaus <- subset(TOC_2, cond == "implaus")
- omnibus_model <- glmer(Accuracy ~ cond + Stimulation + (1|Subject), data=TOC_2, family=binomial())
- summary(omnibus_model)
- condition <- glmer(Accuracy ~ Stimulation + (1|Subject), data=TOC_plaus, family=binomial())
- summary(condition)
- condition <- glmer(Accuracy ~ Stimulation + (1|Subject), data=TOC_implaus, family=binomial())
- summary(condition)
- ```
- # Bayesian
- ### ATL
- ```{r}
- #log-transform
- data_clean <- data_clean %>%
- mutate(
- RT_ms = RT,
- logRT = log(RT_ms),
- Stimulation = factor(Stimulation),
- cond = factor(cond),
- Target = factor(Target),
- Subject = factor(Subject)
- )
- ATL_2 <- filter(data_clean, Target == "ATL")
- mean(ATL_2$logRT)
- # Priors log(RT)
- # b: fixed effect centered on 0, sd 0.04
- # intercept: centered on mean(logRT)
- priors <- c(
- set_prior("normal(0, 0.04)", class = "b"), # fixed effects
- set_prior("student_t(3, 6.87, 0.5)", class = "Intercept"),
- set_prior("exponential(1/0.5)", class = "sd"), # random-subject SD
- set_prior("exponential(1/0.5)", class = "sigma") # residual SD
- )
- ATL_full <- brm(
- formula = logRT ~ cond + Stimulation + (1 | Subject),
- data = ATL_2,
- family = gaussian(),
- prior = priors,
- iter = 2000, warmup = 1000, chains = 4,
- control = list(adapt_delta = 0.95)
- )
- summary(ATL_full)
- #### SUBSET FOR PLAUSIBILITY
- ATL_2_plausible <- filter(ATL_2 , cond == "plausible")
- ATL_2_implausible <- filter(ATL_2 , cond == "implaus")
- ATL_plausible <- brm(
- formula = logRT ~ Stimulation + (1 | Subject),
- data = ATL_2_plausible,
- family = gaussian(),
- prior = priors,
- iter = 2000, warmup = 1000, chains = 4,
- control = list(adapt_delta = 0.95)
- )
- summary(ATL_plausible)
- ATL_implausible <- brm(
- formula = logRT ~ Stimulation + (1 | Subject),
- data = ATL_2_implausible,
- family = gaussian(),
- prior = priors,
- iter = 2000, warmup = 1000, chains = 4,
- control = list(adapt_delta = 0.95)
- )
- summary(ATL_implausible)
- ```
- ### TOC
- ```{r}
- TOC_2 <- filter(data_clean, Target == "TOC")
- mean(TOC_2$logRT)
- # Priors on log(RT)
- # b: fixed effects centered on 0, sd 0.04 ( ±8% ±77 ms at 964ms)
- # intercept: centered on mean(logRT)
- # sd / sigma: weak regularization
- priors <- c(
- set_prior("normal(0, 0.04)", class = "b"), # fixed effects
- set_prior("student_t(3, 6.87, 0.5)", class = "Intercept"),
- set_prior("exponential(1/0.5)", class = "sd"), # random-subject SD
- set_prior("exponential(1/0.5)", class = "sigma") # residual SD
- )
- TOC_full <- brm(
- formula = logRT ~ cond + Stimulation + (1 | Subject),
- data = TOC_2,
- family = gaussian(),
- prior = priors,
- iter = 2000, warmup = 1000, chains = 4,
- control = list(adapt_delta = 0.95)
- )
- summary(TOC_full)
- #### SUBSET FOR PLAUSIBILITY
- TOC_2_plausible <- filter(TOC_2, cond == "plausible")
- TOC_2_implausible <- filter(TOC_2, cond == "implaus")
- TOC_plausible <- brm(
- formula = logRT ~ Stimulation + (1 | Subject),
- data = TOC_2_plausible,
- family = gaussian(),
- prior = priors,
- iter = 2000, warmup = 1000, chains = 4,
- control = list(adapt_delta = 0.95)
- )
- summary(TOC_plausible)
- TOC_implausible <- brm(
- formula = logRT ~ Stimulation + (1 | Subject),
- data = TOC_2_implausible,
- family = gaussian(),
- prior = priors,
- iter = 2000, warmup = 1000, chains = 4,
- control = list(adapt_delta = 0.95)
- )
- summary(TOC_implausible)
- ```
PicturePlausibility_code.qmd, no license · at the source
Overview
- Department of Psychology, University of South Carolina, Columbia, SC, USA
- Linguistics Program, University of South Carolina, Columbia, SC, USA
- Human Neurophysiology and Neuromodulation Lab, Communication Sciences and Disorders, Louisiana State University, Baton Rouge, LA, USA
- Institute for Mind and Brain, University of South Carolina, Columbia, SC, USA
Abstract
The anterior temporal lobe (ATL) is suggested as a semantic hub that may support reading inconsistent words via semantic access. Surface alexia is characterized by difficulty in reading these inconsistent words, and often co-occurs with ATL atrophy and semantic impairments. However, the role of ATL in word reading is unclear, as evidenced by cases of alexia without semantic impairments and semantic impairments without surface alexia. To test its role in reading, we stimulated the ATL using transcranial Direct Current Stimulation in neurotypical participants performing a Word Naming task including consistent and inconsistent words, and a Picture Plausibility (PP) task involving nonverbal semantic judgments. We also stimulated the left tempo-occipital cortex (TOC) during the PP task. Low-frequency inconsistent words were read more slowly than high-frequency inconsistent words in the sham condition. This interaction disappeared with ATL stimulation. We found an interaction between consistency and stimulation in the low-frequency subset, but not in the high-frequency subset. In the PP task, ATL stimulation had no effect, whereas TOC stimulation significantly influenced reaction time. These findings support the left ATL’s role in reading inconsistent words, aligning with surface alexia with ATL atrophy. The results also suggest that the left lateral ATL may be involved in lexical rather than purely semantic processes, consistent with lesion studies demonstrating a dissociation between semantic impairments and surface alexia, and possibly also with graded modality-specific specialization of bilateral ATLs. These findings reconcile conflicting findings and elucidate the role of left lateral ATL in reading.
Reproduced under the paper's license (CC BY), from the paper cited above.
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Availability: 1 check, the latest on 27 September 2026: the link answers (HTTP 200)
- 27 September 2026: the link answers (HTTP 200)
2 files
- PicturePlausibility_code
.qmd , Quarto, 403 lines, 1 match - WordNaming_code.qmd, Quarto, 380 lines
The paper's code and data availability statement is in the Data section.
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Recorded: type, language, journal, volume, pages, dates, 6 authors, 5 keywords, 1 funder, 100 references.
Cite
This paper
Arheix-Parras, S., Xiao, C., Crouse, S., Riccardi, N., Johari, K., & Desai, R. H. (2026). The Role of the Anterior Temporal Lobe in Reading: An HD-tDCS Study. Neurobiology of language (Cambridge, Mass.), 7, NOL.a.266. https://
BibTeX
@article{arheixparras202
author = {Arheix-Parras, Sophie and Xiao, Cheng and Crouse, Sidney and Riccardi, Nicholas and Johari, Karim and Desai, Rutvik H.},
title = {{The Role of the Anterior Temporal Lobe in Reading: An HD-tDCS Study}},
journal = {Neurobiology of language (Cambridge, Mass.)},
year = {2026},
month = jul,
volume = {7},
pages = {NOL.a.266},
publisher = {MIT Press},
issn = {2641-4368},
doi = {10.1162/
url = {https://
pmid = {42491894},
pmcid = {PMC13379303}
}
RIS
TY - JOUR
AU - Arheix-Parras, Sophie
AU - Xiao, Cheng
AU - Crouse, Sidney
AU - Riccardi, Nicholas
AU - Johari, Karim
AU - Desai, Rutvik H.
TI - The Role of the Anterior Temporal Lobe in Reading: An HD-tDCS Study
T2 - Neurobiology of language (Cambridge, Mass.)
J2 - Neurobiol Lang (Camb)
PY - 2026
DA - 2026/
VL - 7
SP - NOL.a.266
SN - 2641-4368
PB - MIT Press
DO - 10.1162/
UR - https://
LA - en
ER -
CSL-JSON
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"id": "10.1162/
"type": "article-journal",
"title": "The Role of the Anterior Temporal Lobe in Reading: An HD-tDCS Study",
"container-title": "Neurobiology of language (Cambridge, Mass.)",
"author": [
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"family": "Arheix-Parras",
"given": "Sophie"
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"family": "Xiao",
"given": "Cheng"
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"given": "Sidney"
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{
"family": "Riccardi",
"given": "Nicholas"
},
{
"family": "Johari",
"given": "Karim"
},
{
"family": "Desai",
"given": "Rutvik H."
}
],
"container-title-short":
"volume": "7",
"page": "NOL.a.266",
"DOI": "10.1162/
"PMID": "42491894",
"PMCID": "PMC13379303",
"ISSN": "2641-4368",
"publisher": "MIT Press",
"URL": "https://
"language": "en",
"issued": {
"date-parts": [
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2026,
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}
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