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ISSN : 1226-9654

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Vol.20 No.1

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PDF Citation An event-related potential study of encoding mechanism underlying spacing effect
pp.1-19 https://doi.org/10.22172/cogbio.2008.20.1.001
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Abstract

Memory for repeated items improves when presentations are spaced during study (spacing effect). To examine the neural mechanisms underlying the spacing effect, event-related potentials (ERPs) were recorded during intentional study phase of a recognition memory paradigm. During study, words were presented once (no repetition) or repeated immediately (massed repetition) or repeated after 6 intervening items (spaced repetition). Participants were then asked to do old/new and confident/no confident judgments. Confident-hit recognition was better for repeated items with delay than immediately repeated items. Mean amplitudes at 230-330ms interval were more positive for massed repetition compared to spaced and no repetition conditions, but mean amplitudes at 330-540ms interval were more positive for spaced and no repetition compared to massed repetition condition. P300 peak amplitudes were more positive for spaced and no repetition compared to massed repetition condition and P300 latencies were shorter for massed repetition compared to spaced and no repetition conditions. In terms of mean amplitudes of time intervals after 230ms, P300 peak amplitudes/latencies, and scalp distributions of potentials, no difference was found between spaced vs. no repetition conditions. These results show that smaller amount of attention is allocated to immediately repeated items than to repeated items with delay. Spacing effect could be explained by deficient processing of immediately repeated items.

PDF Citation The frequency effect in Korean noun eojeols: An eye-tracking study
; ; ; pp.21-37 https://doi.org/10.22172/cogbio.2008.20.1.002
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Abstract

This study investigated the frequency effect in the noun eojeols(noun cluster) in Korean using eye-tracking. In Experiment 1, high-frequency nouns were read faster than low-frequency nouns in sentence context. In Experiment 2, the target eojeol consisted of the nouns in Experiment 1 with the genitive case. Similar to Experiment 1, a noun eojeol with a high-frequency noun was read faster than that with a low-frequency noun. We discussed that these results support Min and Lee's hypothesis (2005, 2007), which claims that a noun eojeol in Korean would be initially analyzed into a noun and a bound morpheme like a case marker, in that the first fixation duration and single fixation duration were shorter in an eojeol with a high-frequency noun than in that with a low-frequency noun.

The Korean Journal of Cognitive and Biological Psychology

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