We investigated the role of dopamine in working memory by examining effects of withdrawing dopaminergic medication in patients with Parkinson's disease. Resistance to distraction during a delayed response task was abnormally enhanced in Parkinson's disease patients OFF medication relative to controls. Conversely, performance on a backward digit span test was impaired in these same Parkinson's disease patients OFF medication. Dopaminergic medication reinstated susceptibility to distraction and backward digit span performance, so that performance of Parkinson's disease patients ON medication did not differ from that of controls. We hypothesize that the enhanced distractor resistance and impaired backward digit span in Parkinson's disease reflects low dopamine levels in the striatum, and perhaps upregulated frontal dopamine levels. Dopaminergic medication may reinstate distractibility by normalizing the balance between striatal and prefrontal dopamine transmission.
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Jikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, JapanJikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, Japan
Murakami, Hidetomo
Okumura, Motohiro
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Jikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, JapanJikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, Japan
Okumura, Motohiro
Ozawa, Masakazu
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Jikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, JapanJikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, Japan
Ozawa, Masakazu
Mimori, Masahiro
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Jikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, JapanJikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, Japan
Mimori, Masahiro
Maku, Takahiro
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Jikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, JapanJikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, Japan
Maku, Takahiro
Shiraishi, Tomotaka
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Jikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, JapanJikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, Japan
Shiraishi, Tomotaka
Kitagawa, Tomomichi
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Jikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, JapanJikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, Japan
Kitagawa, Tomomichi
Takatsu, Hiroki
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Jikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, JapanJikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, Japan
Takatsu, Hiroki
Sato, Takeo
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Jikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, JapanJikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, Japan
Sato, Takeo
Komatsu, Teppei
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Jikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, JapanJikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, Japan
Komatsu, Teppei
Sakai, Kenichiro
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Jikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, JapanJikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, Japan
Sakai, Kenichiro
Umehara, Tadashi
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Jikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, JapanJikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, Japan
Umehara, Tadashi
Omoto, Shusaku
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Jikei Univ, Katsushika Med Ctr, Dept Neurol, Katsushika Ku, 6-42-1 Aoto, Tokyo 1258506, JapanJikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, Japan
Omoto, Shusaku
Mitsumura, Hidetaka
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Jikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, JapanJikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, Japan
Mitsumura, Hidetaka
Iguchi, Yasuyuki
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Jikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, JapanJikei Univ, Sch Med, Dept Neurol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo 1058461, Japan