Lages, Boyle and Jenkins (2017) Study 1A

Data for a study on visual acuity of participants. The data represent the number of words correctly detected at different font size; interest is in effect of illusory contraction on detection. The participants were dichotomized in two groups based on their visual acuity based on median split.

Usage

LBJ17_S1A

Format

A data frame with 1760 rows and 6 variables:

nerror: [double] number of incorrectly identified letters out of 4
adaptation: [factor] either preadaptation phase (preadaptation) or adaptation to contracting motion (contracting)
fontsize: [factor] font size, in logMAR, one of -0.3, -0.2, -0.1 and 0
position: [factor] position of the letter from left (1) to right (5)
id: [factor] participant identifier
acuity: [factor] acuity group, either normal or high

Source

Open Science Foundation, https://osf.io/nav9h/, unspecified license

References

Lages, M., Boyle, S. C., & Jenkins, R. (2017). Illusory Increases in Font Size Improve Letter Recognition. Psychological Science, 28(8), 1180–1188. doi:10.1177/0956797617705391

Examples

if (FALSE) { # \dontrun{
# Code to reproduce Figure 2a
library(dplyr)
library(ggplot2)
LBJ17_S1A |>
group_by(acuity, fontsize, adaptation, id) |>
 summarize(ncorrect = 20 - sum(nerror))|>
 group_by(acuity, fontsize, adaptation) |>
 summarize(mean = mean(ncorrect))|>
 ggplot(mapping = aes(y = mean,
                      x = as.numeric(fontsize),
                      color = adaptation,
                      shape = acuity)) +
 geom_point() +
 geom_line() +
 labs(x = "Letter Size (logMAR)",
      y = "Number of Letters (Correct)")
} # }