Evidence map›Paper›PMID 41541899›Full record

ArticlePCN reports : psychiatry and clinical neurosciences2026

Differential working memory changes following methylphenidate in medication-naive and medication-experienced adults with ADHD.

Masaaki Shimizu, Shunsuke Takagi, Ryuta Aoki, Takashi Itahashi, Yumi Shikauchi, Hironobu Nakamura, Genichi Sugihara, Hidehiko Takahashi, Motoaki Nakamura

Abstract read
In one paragraph

Article in PCN reports : psychiatry and clinical neurosciences, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

0numbers the graph read from it
0cells of the map it votes in
1citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

1 citing paper in PubMed.

  1. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Masaaki ShimizuDepartment of Psychiatry and Behavioral Sciences, Graduate School of Medical and Dental Sciences Institute of Science Tokyo Tokyo Japan.ORCID https://orcid.org/0000-0002-2014-0161
Shunsuke TakagiDepartment of Psychiatry and Behavioral Sciences, Graduate School of Medical and Dental Sciences Institute of Science Tokyo Tokyo Japan.
Ryuta AokiMedical Institute of Developmental Disabilities Research Showa Medical University Tokyo Japan.
Takashi ItahashiMedical Institute of Developmental Disabilities Research Showa Medical University Tokyo Japan.
Yumi ShikauchiMedical Institute of Developmental Disabilities Research Showa Medical University Tokyo Japan.
Hironobu NakamuraDepartment of Psychiatry and Behavioral Sciences, Graduate School of Medical and Dental Sciences Institute of Science Tokyo Tokyo Japan.
Genichi SugiharaDepartment of Psychiatry and Behavioral Sciences, Graduate School of Medical and Dental Sciences Institute of Science Tokyo Tokyo Japan.
Hidehiko TakahashiDepartment of Psychiatry and Behavioral Sciences, Graduate School of Medical and Dental Sciences Institute of Science Tokyo Tokyo Japan.
Motoaki NakamuraMedical Institute of Developmental Disabilities Research Showa Medical University Tokyo Japan.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Aim: The long-term impact of pharmacological treatment on cognitive function in adults with attention-deficit/hyperactivity disorder (ADHD), particularly whether benefits persist after treatment discontinuation, is not well understood. This study aimed to investigate whether prior medication history is associated with different patterns of cognitive change following methylphenidate (MPH) administration. Methods: Thirty-six adults with ADHD (17 medication-naive, 19 medication-experienced) were assessed on five cognitive tasks, the multitasking test (MTT), reaction time (RTI), rapid visual processing (RVP), stop signal task (SST), and spatial working memory (SWM), from the Cambridge Neuropsychological Test Automated Battery baseline and following a period of clinically stable MPH treatment (Post). We used mixed-design ancovas to test for Time × Medication history interactions. Results: We found a significant interaction in the SWM task (6-box condition; Conclusion: Two groups showed differential trajectories of change in the SWM task. Rather than reflecting a purely pharmacological effect, these patterns may involve a combination of baseline cognitive differences, learned cognitive strategies, and pre-existing individual characteristics. These preliminary findings highlight the importance of considering treatment history in clinical practice and research.

Indexed as

attention‐deficit/hyperactivity disorderCANTABmedication historymethylphenidatespatial working memory

Identifiers

PMID41541899
PMCPMC12800564

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.