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No Clear Association between Impaired Short-Term or Working Memory Storage and Time Reproduction Capacity in Adult ADHD Patients.

Mette C, Grabemann M, Zimmermann M, Strunz L, Scherbaum N, Wiltfang J, Kis B - PLoS ONE (2015)

Bottom Line: The patients with ADHD exhibited lower memory performance scores than the HCs.No significant differences in the raw scores for any of the time intervals (p > .05), with the exception of the variability at the short time intervals (1 s, 4 s and 6 s) (p < .01), were found between the groups.The overall analyses failed to reveal any significant correlations between time reproduction at any of the time intervals examined in the time reproduction task and working memory performance (p > .05).

View Article: PubMed Central - PubMed

Affiliation: LVR Hospital Essen, Department of Psychiatry and Psychotherapy, Faculty of Medicine, University of Duisburg-Essen, Essen, Germany.

ABSTRACT

Objective: Altered time reproduction is exhibited by patients with adult attention deficit hyperactivity disorder (ADHD). It remains unclear whether memory capacity influences the ability of adults with ADHD to reproduce time intervals.

Method: We conducted a behavioral study on 30 ADHD patients who were medicated with methylphenidate, 29 unmedicated adult ADHD patients and 32 healthy controls (HCs). We assessed time reproduction using six time intervals (1 s, 4 s, 6 s, 10 s, 24 s and 60 s) and assessed memory performance using the Wechsler memory scale.

Results: The patients with ADHD exhibited lower memory performance scores than the HCs. No significant differences in the raw scores for any of the time intervals (p > .05), with the exception of the variability at the short time intervals (1 s, 4 s and 6 s) (p < .01), were found between the groups. The overall analyses failed to reveal any significant correlations between time reproduction at any of the time intervals examined in the time reproduction task and working memory performance (p > .05).

Conclusion: We detected no findings indicating that working memory might influence time reproduction in adult patients with ADHD. Therefore, further studies concerning time reproduction and memory capacity among adult patients with ADHD must be performed to verify and replicate the present findings.

No MeSH data available.


Related in: MedlinePlus

Time reproduction performance.Between-group differences in the coefficient of variation, indicating the variability in performance, for the reproduction times at the 1 s, 4 s and 6 s intervals for all groups. The means and standard deviations of the coefficients of variation for the 1 s, 4 s and 6 s time intervals are shown. MPH+: patients with ADHS who were taking methylphenidate medication; MPH-: patients with ADHD who were not taking methylphenidate; HC: healthy controls; *p < .05; **p < .01.
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pone.0133714.g001: Time reproduction performance.Between-group differences in the coefficient of variation, indicating the variability in performance, for the reproduction times at the 1 s, 4 s and 6 s intervals for all groups. The means and standard deviations of the coefficients of variation for the 1 s, 4 s and 6 s time intervals are shown. MPH+: patients with ADHS who were taking methylphenidate medication; MPH-: patients with ADHD who were not taking methylphenidate; HC: healthy controls; *p < .05; **p < .01.

Mentions: The H tests of the time interval SDs revealed significant differences in the SDs of the reproduction durations at the 1 s (H(2) = 6.14, p < .04), 4 s (H(2) = 8.70, p < .01) and 6 s intervals (H(2) = 8.54, p < .01) on the time reproduction task. The H tests of the coefficients of variation revealed significant differences for the 1 s (H(2) = 6.43, p = .04), 4 s (H(2) = 7.98, p < .01) and 6 s intervals (H(2) = 6.88, p < .03; Fig 1). No significant differences between the groups were found at any of the other time intervals.


No Clear Association between Impaired Short-Term or Working Memory Storage and Time Reproduction Capacity in Adult ADHD Patients.

Mette C, Grabemann M, Zimmermann M, Strunz L, Scherbaum N, Wiltfang J, Kis B - PLoS ONE (2015)

Time reproduction performance.Between-group differences in the coefficient of variation, indicating the variability in performance, for the reproduction times at the 1 s, 4 s and 6 s intervals for all groups. The means and standard deviations of the coefficients of variation for the 1 s, 4 s and 6 s time intervals are shown. MPH+: patients with ADHS who were taking methylphenidate medication; MPH-: patients with ADHD who were not taking methylphenidate; HC: healthy controls; *p < .05; **p < .01.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4519336&req=5

pone.0133714.g001: Time reproduction performance.Between-group differences in the coefficient of variation, indicating the variability in performance, for the reproduction times at the 1 s, 4 s and 6 s intervals for all groups. The means and standard deviations of the coefficients of variation for the 1 s, 4 s and 6 s time intervals are shown. MPH+: patients with ADHS who were taking methylphenidate medication; MPH-: patients with ADHD who were not taking methylphenidate; HC: healthy controls; *p < .05; **p < .01.
Mentions: The H tests of the time interval SDs revealed significant differences in the SDs of the reproduction durations at the 1 s (H(2) = 6.14, p < .04), 4 s (H(2) = 8.70, p < .01) and 6 s intervals (H(2) = 8.54, p < .01) on the time reproduction task. The H tests of the coefficients of variation revealed significant differences for the 1 s (H(2) = 6.43, p = .04), 4 s (H(2) = 7.98, p < .01) and 6 s intervals (H(2) = 6.88, p < .03; Fig 1). No significant differences between the groups were found at any of the other time intervals.

Bottom Line: The patients with ADHD exhibited lower memory performance scores than the HCs.No significant differences in the raw scores for any of the time intervals (p > .05), with the exception of the variability at the short time intervals (1 s, 4 s and 6 s) (p < .01), were found between the groups.The overall analyses failed to reveal any significant correlations between time reproduction at any of the time intervals examined in the time reproduction task and working memory performance (p > .05).

View Article: PubMed Central - PubMed

Affiliation: LVR Hospital Essen, Department of Psychiatry and Psychotherapy, Faculty of Medicine, University of Duisburg-Essen, Essen, Germany.

ABSTRACT

Objective: Altered time reproduction is exhibited by patients with adult attention deficit hyperactivity disorder (ADHD). It remains unclear whether memory capacity influences the ability of adults with ADHD to reproduce time intervals.

Method: We conducted a behavioral study on 30 ADHD patients who were medicated with methylphenidate, 29 unmedicated adult ADHD patients and 32 healthy controls (HCs). We assessed time reproduction using six time intervals (1 s, 4 s, 6 s, 10 s, 24 s and 60 s) and assessed memory performance using the Wechsler memory scale.

Results: The patients with ADHD exhibited lower memory performance scores than the HCs. No significant differences in the raw scores for any of the time intervals (p > .05), with the exception of the variability at the short time intervals (1 s, 4 s and 6 s) (p < .01), were found between the groups. The overall analyses failed to reveal any significant correlations between time reproduction at any of the time intervals examined in the time reproduction task and working memory performance (p > .05).

Conclusion: We detected no findings indicating that working memory might influence time reproduction in adult patients with ADHD. Therefore, further studies concerning time reproduction and memory capacity among adult patients with ADHD must be performed to verify and replicate the present findings.

No MeSH data available.


Related in: MedlinePlus