WOBIB: 35 - Jernigan, et al. (1998) Brain activation du ...
 
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Terry L. Jernigan; A. L. Ostergaard; Ian Law; Claus Svarer; Christian Gerlach; O. B. Paulson. Brain activation during word identification and word recognition. NeuroImage 8(1):93-105, 1998. PMID: 9698579. WOBIB: 35.

Previous memory research has suggested that the effects of prior study observed in priming tasks are functionally, and neurobiologically, distinct phenomena from the kind of memory expressed in conventional (explicit) memory tests. Evidence for this position comes from observed dissociations between memory scores obtained with the two kinds of tasks. However, there is continuing controversy about the meaning of these dissociations. In recent studies, Ostergaard (1998a, Memory Cognit, 26:40-60; 1998b, J. Int. Neuropsychol. Soc., in press) showed that simply degrading visual word stimuli can dramatically alter the degree to which word priming shows a dissociation from word recognition; i.e., effects of a number of factors on priming paralleled their effects on recognition memory tests when the words were degraded at test. In the present study, cerebral blood flow changes were measured while subjects performed the word identification (reading) and recognition memory tasks used previously by Ostergaard. The results are the direct comparisons of the two tasks and the effects of stimulus degradation on blood flow patterns during the tasks. Clear differences between word identification and word recognition were observed: the latter task evoked considerably more prefrontal activity and stronger cerebellar activation. Stimulus degradation was associated with focal increases in bilateral fusiform regions within the occipital lobe. No task, degradation, or item repetition effects were demonstrated in mesial temporal regions, no repetition effects were observed in any region, and there was no evidence for different effects of stimulus degradation in the priming and recognition memory conditions. Power limitations may have contributed to the null effects.

Asymmetry: -0.23401 (left: -1, right: +1)

VRML2 file (160 Kb)

1 Word identification. Read visually presented words aloud versus fixation. WOEXP: 116.
2 Fixation versus word identification. Fixation on a central cross on the screen versus reading aloud of visually presented words. WOEXP: 117.
3 Word recognition. Respond with "old" or "new" if visually presented words had been presented earlier versus fixation. WOEXP: 118.
4 Fixation versus word recognition. Fixation on a central cross on the screen versus responding to visually presented words. WOEXP: 119.
5 Word recognition versus word identification. Responding to visually presented words that either have been presented before or not versus read visually presented words aloud. WOEXP: 120.
6 Word identification versus word recognition. Read visually presented words aloud versus responding to visually presented words that either have been presented before or not. WOEXP: 121.
7 Degraded versus undegraded words. Read visually degraded words versus reading undegraded words. WOEXP: 122.


corner cube of WOBIB_35

Related - positive correlated volumes

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-3: 0.06003 Richard J. Maddock; Michael H. Buonocore. Activation of left posterior cingulate gyrus by the auditory presentation of threat-related words: an fMRI study. Psychiatry Research 75(1):1-14, 1997. PMID: 9287369. FMRIDCID: . WOBIB: 165.

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