Brain identification times of letters


  • Madec S.
  • Rey Arnaud R
  • Dufau Stéphane
  • Klein Michael
  • Grainger Jonathan

document type



In the present study, 125 letter-naming response times were recorded for each of the 26 uppercase letters of the alphabet and for 6 participants. The same participants also produced 100 delayed naming times for each letter. They finally participated in an event-related potential (ERP) study, in which individual-letter ERPs were obtained by recording 100 trials per letter and per participant. We first computed a simple linear regression between naming and delayed naming latencies that led to an r2 of .79, indicating that a huge amount of the letter-naming variance is produced by output processes. Second, residuals of the regression were used as variance reflecting letter identification processes and were correlated with the individual- letter ERP variance from 0 up to 200 msec after stimulus onset. Significant repeated correlations were observed from 160 to 180 msec after stimulus onset, suggesting that brain letter identification processes take place within this time window.

more information