Psychopharmacology

, 202:497 | Cite as

Effects of atomoxetine and methylphenidate on performance of a lateralized reaction time task in rats

Original Investigation

Abstract

Rationale

The ability to detect unpredictable cues can involve stimulus-elicited orienting of attention (bottom-up processing); however, in many settings, target onset is partially predictable, meaning that subjects can benefit from the rule-guided, endogenous control of attention (top-down processing). Noradrenaline has been implicated in attention per se, but it is not clear whether it differentially participates in these two dimensions of attentional function.

Objectives

We sought to examine the effects of selective or nonselective inhibitors of noradrenaline reuptake on different modes of attentional performance in rats.

Materials and methods

Adult male Long–Evans rats were trained to perform a lateralized reaction time task where a variable-duration preparatory period preceded delivery of a visual target stimulus. Atomoxetine (1 mg/kg, i.p.) or methylphenidate (0.32 mg/kg, i.p.) were administered before sessions in which the preparatory period was systematically varied.

Results

When the preparatory time was brief (0.2 s), response times were significantly longer than when the preparatory time was long (1.0 s), suggesting that rats were able to orient their attention before target onset when the longer period was imposed. Atomoxetine differentially modulated performance in these two conditions, improving response accuracy when a long preparatory period was imposed but impairing accuracy when the preparatory time was made brief. Methylphenidate did not differentially affect responding under the two conditions.

Conclusions

These data suggest that selective inhibition of the noradrenaline transporter may specifically benefit attentional performance of tasks that permit the controlled recruitment of attention, rather than during tests of pure stimulus-driven attention.

Keywords

Norepinephrine Cognitive control Stimulant drugs ADHD Attention Dopamine 

Notes

Acknowledgement

These experiments were funded, in part, by PHS grants P50-MH77248 and P20-DA22539 to JDJ and a grant from the Tenenbaum Creativity Initiative at UCLA.

Conflicts of interest statement

The authors have no competing conflicts of interest.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • J. David Jentsch
    • 1
    • 2
  • Shawn M. Aarde
    • 1
  • Emanuele Seu
    • 1
  1. 1.Department of PsychologyUniversity of California, Los AngelesLos AngelesUSA
  2. 2.Department of Psychiatry and Biobehavioral SciencesUniversity of California, Los AngelesLos AngelesUSA

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