The information acquired during artificial grammar learning. Knowlton, B. J. & Squire, L. R. J Exp Psychol Learn Mem Cogn, 20(1):79-91, 1994.
abstract   bibtex   
In an artificial grammar learning task, amnesic patients classified test items as well as normal subjects did. Item similarity did not affect grammaticality judgments when similar and nonsimilar test items were balanced for the frequency with which bigrams and trigrams (chunks) that appeared in the training set also appeared in the test items. Amnesic patients performed like normal subjects. The results suggest that concrete information about letter chunks can influence gramaticality judgments and that this information is acquired implicitly. The similarity of whole test items to training items does not appear to affect grammaticality judgments.
@Article{Knowlton1994,
  author   = {B. J. Knowlton and L. R. Squire},
  journal  = {J Exp Psychol Learn Mem Cogn},
  title    = {The information acquired during artificial grammar learning.},
  year     = {1994},
  number   = {1},
  pages    = {79-91},
  volume   = {20},
  abstract = {In an artificial grammar learning task, amnesic patients classified
	test items as well as normal subjects did. Item similarity did not
	affect grammaticality judgments when similar and nonsimilar test
	items were balanced for the frequency with which bigrams and trigrams
	(chunks) that appeared in the training set also appeared in the test
	items. Amnesic patients performed like normal subjects. The results
	suggest that concrete information about letter chunks can influence
	gramaticality judgments and that this information is acquired implicitly.
	The similarity of whole test items to training items does not appear
	to affect grammaticality judgments.},
  groups   = {Implicit vs. declarative learning},
  keywords = {Aged, Amnesia, Brain, Female, Humans, Language, Learning, Male, Middle Aged, Non-P.H.S., Non-U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Wechsler Scales, 8138790},
}

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