The neural substrates of visual implicit memory: Do the two hemispheres play different roles?

Neal E A Kroll, A. P. Yonelinas, M. M. Kishiyama, Kathleen Baynes, R. T. Knight, M. S. Gazzaniga

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Identification of visually presented words is facilitated by implicit memory, or visual priming, for past visual experiences with those words. There is disagreement over the neuroanatomical substrates of this form of implicit memory. Several studies have suggested that this form of priming relies on a visual word-form system localized in the right occipital lobe, whereas other studies have indicated that both hemispheres are equally involved. The discrepancies may be related to the types of priming tasks that have been used because the former studies have relied primarily on word-stem completion tasks and the latter on tasks like word-fragment completion. The present experiments compared word-fragment and word-stem measurements of visual implicit memory, in patients with right occipital lobe lesions and patients with complete callosotomies. The patients showed normal visual implicit memory on fragment completion tests, but essentially no visual priming on standard stem completion tests. However, when we used a set of word stems that had only one correct solution for each test item, as was true of the items in the fragment completion tests, the patients showed normal priming effects. The results indicate that visual implicit memory for words is not solely dependent upon the right hemisphere, rather it reflects changes in processing efficiency in bilateral visual regions involved in the initial processing of the items. However, under conditions of high lexical competition (i.e., multiple completion word stems), the lexical processes, which are dominant in the left hemisphere, overshadow the visual priming supported by the left hemisphere.

Original languageEnglish (US)
Pages (from-to)833-842
Number of pages10
JournalJournal of Cognitive Neuroscience
Volume15
Issue number6
DOIs
StatePublished - Aug 15 2003

Fingerprint

Occipital Lobe
Patient Rights
Efficiency

ASJC Scopus subject areas

  • Behavioral Neuroscience
  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience

Cite this

The neural substrates of visual implicit memory : Do the two hemispheres play different roles? / Kroll, Neal E A; Yonelinas, A. P.; Kishiyama, M. M.; Baynes, Kathleen; Knight, R. T.; Gazzaniga, M. S.

In: Journal of Cognitive Neuroscience, Vol. 15, No. 6, 15.08.2003, p. 833-842.

Research output: Contribution to journalArticle

Kroll, Neal E A ; Yonelinas, A. P. ; Kishiyama, M. M. ; Baynes, Kathleen ; Knight, R. T. ; Gazzaniga, M. S. / The neural substrates of visual implicit memory : Do the two hemispheres play different roles?. In: Journal of Cognitive Neuroscience. 2003 ; Vol. 15, No. 6. pp. 833-842.
@article{e6b6ae6ccad547dbbdeff6d3b5937e6e,
title = "The neural substrates of visual implicit memory: Do the two hemispheres play different roles?",
abstract = "Identification of visually presented words is facilitated by implicit memory, or visual priming, for past visual experiences with those words. There is disagreement over the neuroanatomical substrates of this form of implicit memory. Several studies have suggested that this form of priming relies on a visual word-form system localized in the right occipital lobe, whereas other studies have indicated that both hemispheres are equally involved. The discrepancies may be related to the types of priming tasks that have been used because the former studies have relied primarily on word-stem completion tasks and the latter on tasks like word-fragment completion. The present experiments compared word-fragment and word-stem measurements of visual implicit memory, in patients with right occipital lobe lesions and patients with complete callosotomies. The patients showed normal visual implicit memory on fragment completion tests, but essentially no visual priming on standard stem completion tests. However, when we used a set of word stems that had only one correct solution for each test item, as was true of the items in the fragment completion tests, the patients showed normal priming effects. The results indicate that visual implicit memory for words is not solely dependent upon the right hemisphere, rather it reflects changes in processing efficiency in bilateral visual regions involved in the initial processing of the items. However, under conditions of high lexical competition (i.e., multiple completion word stems), the lexical processes, which are dominant in the left hemisphere, overshadow the visual priming supported by the left hemisphere.",
author = "Kroll, {Neal E A} and Yonelinas, {A. P.} and Kishiyama, {M. M.} and Kathleen Baynes and Knight, {R. T.} and Gazzaniga, {M. S.}",
year = "2003",
month = "8",
day = "15",
doi = "10.1162/089892903322370753",
language = "English (US)",
volume = "15",
pages = "833--842",
journal = "Journal of Cognitive Neuroscience",
issn = "0898-929X",
publisher = "MIT Press Journals",
number = "6",

}

TY - JOUR

T1 - The neural substrates of visual implicit memory

T2 - Do the two hemispheres play different roles?

AU - Kroll, Neal E A

AU - Yonelinas, A. P.

AU - Kishiyama, M. M.

AU - Baynes, Kathleen

AU - Knight, R. T.

AU - Gazzaniga, M. S.

PY - 2003/8/15

Y1 - 2003/8/15

N2 - Identification of visually presented words is facilitated by implicit memory, or visual priming, for past visual experiences with those words. There is disagreement over the neuroanatomical substrates of this form of implicit memory. Several studies have suggested that this form of priming relies on a visual word-form system localized in the right occipital lobe, whereas other studies have indicated that both hemispheres are equally involved. The discrepancies may be related to the types of priming tasks that have been used because the former studies have relied primarily on word-stem completion tasks and the latter on tasks like word-fragment completion. The present experiments compared word-fragment and word-stem measurements of visual implicit memory, in patients with right occipital lobe lesions and patients with complete callosotomies. The patients showed normal visual implicit memory on fragment completion tests, but essentially no visual priming on standard stem completion tests. However, when we used a set of word stems that had only one correct solution for each test item, as was true of the items in the fragment completion tests, the patients showed normal priming effects. The results indicate that visual implicit memory for words is not solely dependent upon the right hemisphere, rather it reflects changes in processing efficiency in bilateral visual regions involved in the initial processing of the items. However, under conditions of high lexical competition (i.e., multiple completion word stems), the lexical processes, which are dominant in the left hemisphere, overshadow the visual priming supported by the left hemisphere.

AB - Identification of visually presented words is facilitated by implicit memory, or visual priming, for past visual experiences with those words. There is disagreement over the neuroanatomical substrates of this form of implicit memory. Several studies have suggested that this form of priming relies on a visual word-form system localized in the right occipital lobe, whereas other studies have indicated that both hemispheres are equally involved. The discrepancies may be related to the types of priming tasks that have been used because the former studies have relied primarily on word-stem completion tasks and the latter on tasks like word-fragment completion. The present experiments compared word-fragment and word-stem measurements of visual implicit memory, in patients with right occipital lobe lesions and patients with complete callosotomies. The patients showed normal visual implicit memory on fragment completion tests, but essentially no visual priming on standard stem completion tests. However, when we used a set of word stems that had only one correct solution for each test item, as was true of the items in the fragment completion tests, the patients showed normal priming effects. The results indicate that visual implicit memory for words is not solely dependent upon the right hemisphere, rather it reflects changes in processing efficiency in bilateral visual regions involved in the initial processing of the items. However, under conditions of high lexical competition (i.e., multiple completion word stems), the lexical processes, which are dominant in the left hemisphere, overshadow the visual priming supported by the left hemisphere.

UR - http://www.scopus.com/inward/record.url?scp=0042324157&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0042324157&partnerID=8YFLogxK

U2 - 10.1162/089892903322370753

DO - 10.1162/089892903322370753

M3 - Article

C2 - 14511536

AN - SCOPUS:0042324157

VL - 15

SP - 833

EP - 842

JO - Journal of Cognitive Neuroscience

JF - Journal of Cognitive Neuroscience

SN - 0898-929X

IS - 6

ER -