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These results are also relevant to Adaptation Theory, a recent proposal by Kolk and Heeschen [Kolk, H., and Heeschen, C., 1985, Agrammatism versus paragrammatism: A shift of behavioral control, paper presented at Academy of Aphasia 23rd Annual Meeting, Pittsburgh, PA] that revises Hughlings Jackson's notion of "positive symptoms" ([Jackson, H. J., 1931, “Selected Writings of John Hughlings Jackson”, Hodder and Stoughton, London]; see [Kolk, H. and van Grunsven, M., 1985, Agrammatism as a variable phenomenon, “Cognitive Neuropsychology”, 2, pp. 347-384; Heeschen , C., 1985, Agrammatism versus paragrammatism: a fictiosus opposition, in Kean, M. L., ed., “Agrammatism”, Academic Press, New York; and Kolk, H., van Grunsven, M., and Keyser, A., 1985, On parallelism between production and comprehension in agrammatism, in in Kean, M. L., ed., “Agrammatism”, Academic Press, New York]). According to this view, many of the symptoms displayed by aphasic patients - particularly non-fluent Broca's aphasics - represent a deliberate attempt to avoid errors by producing brief but well-formed elliptical utterances. These positive symptoms can be contrasted with the "negative symptoms" that occurr in patients who produce disorganized but fluent speech. - Bates & Friederici & Wulfeck (2004), a pag.295
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