Abstract：
:This study was designed to explore whether the human visual system has different degrees of tolerance to character position changes for letter strings, digit strings, and symbol strings. An explicit perceptual matching task was used (same-different judgment), and participants' electrophysiological activity was recorded. Materials included trials in which the referent stimulus and the target stimulus were identical or differed either by two character replacements or by transposing two characters. Behavioral results showed clear differences in the magnitude of the transposed-character effect for letters as compared with digit and symbol strings. Electrophysiological data confirmed this observation, showing an N2 character transposition effect that was only present for letter strings. An earlier N1 transposition effect was also found for letters but was absent for symbols and digits, whereas a later P3 effect was found for all types of string. These results provide evidence for a position coding mechanism that is specific to letter strings, that was most prominent in an epoch between 200 and 325 msec, and that operates in addition to more general-purpose position coding mechanisms.
journal_name
J Cogn Neuroscijournal_title
Journal of cognitive neuroscienceauthors
Duñabeitia JA,Dimitropoulou M,Grainger J,Hernández JA,Carreiras Mdoi
10.1162/jocn_a_00180subject
Has Abstractpub_date
2012-07-01 00:00:00pages
1610-24issue
7eissn
0898-929Xissn
1530-8898journal_volume
24pub_type
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