WOBIB: 178 - Poldrack, et al. (1999) Functional Speciali ...
 
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Russell A. Poldrack; Anthony D. Wagner; Matthew W. Prull; John E. Desmond; Gary H. Glover; John D. E. Gabrieli. Functional Specialization for Sematic and Phonological Processing in the Left Inferior Prefrontal Cortex. NeuroImage 10(1):15-35, 1999. PMID: 10385578. DOI: 10.10061/nimg.1999.0441. FMRIDCID: . WOBIB: 178.

Neuroimaging and neuropsychological studies have implicated left inferior prefrontal cortex (LIPC) in both semantic and phonological processing. In this study, functional magnetic resonance imaging was used to examine whether separate LIPC regions participate in each of these types of processing. Performance of a semantic decision task resulted in extensive LIPC activation compared to a perceptual control task. Phonological processing of words and pseudowords in a syllable-counting task resulted in activation of the dorsal aspect of the left inferior frontal gyrus near the inferior frontal sulcus (BA 44/45) compared to a perceptual control task, with greater activation for nonwords compared to words. In a direct comparison of semantic and phonological tasks, semantic processing preferentially activated the ventral aspect of the left inferior frontal gyrus (BA 47/45). A review of the literature demonstrated a similar distinction between left prefrontal regions involved in semantic processing and phonological/lexical processing. The results suggest that a distinct region in the left inferior frontal cortex is involved in semantic processing, whereas other regions may subserve phonological processes engaged during both semantic and phonological tasks.

Asymmetry: -0.68877 (left: -1, right: +1)

VRML2 file (348 Kb)

1 Semantic versus case. Decision whether a visually presented word is abstract or concrete with right hand response button press versus decision based on the case of the letters in the word. WOEXP: 550.
2 Case versus semantic. Decision based on the case of the letters in the word with right hand button press versuswhether a visually presented word is abstract or concrete. WOEXP: 551.
3 Syllable counting versus case judgment. Counting the number of syllables in a visually presented word versus decision based on the case of the letters in the word. WOEXP: 552.
4 Case judgment versus syllable counting. Case judgment of letters from visually presented words with button press versus counting the number of syllables in a visually presented word. WOEXP: 553.
5 Semantic versus syllable counting. Decision whether a visually presented word is abstract or concrete with right hand response button press versus syllable counting. WOEXP: 554.
6 Syllable counting versus semantic judgment. Syllable counting of visually presented words and button press with right hand versus decision whether a visually presented word is abstract or concrete. WOEXP: 555.
7 Pseudoword syllable counting versus case judgment. Counting the number of syllables in a visually presented pseudoword versus decision based on the case of the letters in the word. WOEXP: 556.
8 Case judgment versus pseudoword syllable counting. Case judgment of letters from visually presented words with button press versus counting the number of syllables in a visually presented pseudoword. WOEXP: 557.
9 Semantic versus syllable counting via case judgment. Decision whether a visually presented word is abstract or concrete with right hand response button press versus syllable counting with case judgment as double subtracted. WOEXP: 558.
10 Syllable counting versus semantic judgment via case judgment. Syllable counting of visually presented words and button press with right hand versus decision whether a visually presented word is abstract or concrete with case judgment as double subtraction. WOEXP: 559.
11 Semantic versus pseudoword syllable counting via case judgment. Decision whether a visually presented word is abstract or concrete with right hand response button press versus syllable counting of peudowords with case judgment as double subtracted. WOEXP: 560.
12 Pseudoword syllable counting versus semantic judgment via case judgment. Syllable counting of visually presented pseudowords and button press with right hand versus decision whether a visually presented word is abstract or concrete with case judgment as double subtraction. WOEXP: 561.


corner cube of WOBIB_178

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