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ISSN : 1226-9654

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Vol.20 No.3

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Episodic Encoding Mechanism of Words, Pictures and Abstract Patterns: an event-related fMRI Study

The Korean Journal of Cognitive and Biological Psychology / The Korean Journal of Cognitive and Biological Psychology, (P)1226-9654; (E)2733-466X
2008, v.20 no.3, pp.123-143
https://doi.org/10.22172/cogbio.2008.20.3.001



& (2008). Episodic Encoding Mechanism of Words, Pictures and Abstract Patterns: an event-related fMRI Study. The Korean Journal of Cognitive and Biological Psychology, 20(3), 123-143, https://doi.org/10.22172/cogbio.2008.20.3.001

Abstract

To investigate how the mechanisms of memory encoding were influenced by the verbalizability of nonverbal material and the imageability of verbal material, an event-related fMRI study was performed. Subjects were asked to intentionally memorize the mixtures of concrete words, object pictures, and abstract patterns and then perform recognition judgement test. Recognition scores revealed the superior accuracy for pictures and the worst accuracy for abstract patterns. Analyses of signal change ratio at the superior PFC(BA 6), superior parietal lobe(BA 7), and medial temporal lobe revealed right-lateralized frontal activation during abstract pattern encoding, no lateralized frontal activation during word and picture encoding, and higher right-frontal activation during abstract pattern encoding than word and picture encoding. No lateralized parietal activation during encoding was observed on all types of learning materials, and higher bilateral-parietal activation during abstract pattern encoding than during word and picture encoding was observed. No lateralized, nor differential MTL activation during encoding was observed on all types of learning materials. Analyses of contrast among learning materials revealed similar activation patterns at superior PFC and superior parietal lobe but different activation patterns at MTL, showing higher bilateral-MTL activation during word and picture encoding than during abstract pattern encoding as well as higher right-MTL activation during picture encoding than during word encoding. The overall bilateral activation patterns of words were similar to those of pictures, but activation patterns of words and pictures were different from those of abstract patterns. The data support the code-specificity rather than material-specificity hypothesis and indicate that the neural mechanisms of intentional memory encoding were dependent on the types of learning materials.

keywords
verbalizability, imageability, memory encoding, code-specificity, fMRI, 언어화, 심상화, 기억 부호화, 부호-특수성, fMRI, verbalizability, imageability, memory encoding, code-specificity, fMRI

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