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Verbal memory improved by D-amphetamine: influence of the testing effect.

Inge Zeeuws1, Natacha Deroost, Eric Soetens

  • 1Experimental and Applied Psychology, Vrije Universiteit Brussel (VUB), Brussel, Belgium.

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D-amphetamine enhances long-term verbal memory but does not influence the testing effect. This suggests the drug impacts memory consolidation through mechanisms other than repeated testing.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • D-amphetamine is known to improve long-term verbal memory, potentially by influencing memory consolidation.
  • Intermediate testing significantly enhances memory retention, a phenomenon known as the testing effect.

Purpose of the Study:

  • To investigate if D-amphetamine modulates the testing effect in verbal long-term recognition memory.
  • To determine if the drug's impact on memory consolidation is linked to repeated testing.

Main Methods:

  • Two double-blind, placebo-controlled studies involving 40 male participants.
  • Experiment 1: Manipulated the number of recognition tests administered.
  • Experiment 2: Compared repeated versus non-repeated testing of the same verbal items.

Main Results:

  • D-amphetamine enhanced delayed recognition, but immediate recognition remained unaffected.
  • The number of intermediate recognition tests did not influence drug effects.
  • Repeated testing of the same items was not modulated by D-amphetamine.

Conclusions:

  • D-amphetamine's memory-enhancing effects are independent of the testing effect.
  • The drug likely modulates other aspects of memory consolidation, possibly context-related effects.