Differential modulation of clock speed by the administration of intermittent versus continuous cocaine.


Journal Article

The roles that psychostimulant sensitization and tolerance play in temporal perception in the seconds-to-minutes range were assessed in rats. Cocaine (20 mg/kg/day) was administered for 2 weeks either intermittently via daily injections (induces sensitization) or continuously via an osmotic minipump (induces tolerance). Interval timing was evaluated throughout administration and withdrawal. Injections of cocaine caused immediate, proportional, leftward shifts in peak times, indicating an increase in the speed of an internal clock. These shifts grew progressively larger with repeated administration, indicating that stimulant-induced increases in clock speed can be sensitized. Continuous cocaine administration produced no reliable effects. These results suggest that the mechanisms of sensitization may play a considerable role in drug-induced alterations of the perception of time.

Full Text

Cited Authors

  • Matell, MS; King, GR; Meck, WH

Published Date

  • February 2004

Published In

Volume / Issue

  • 118 / 1

Start / End Page

  • 150 - 156

PubMed ID

  • 14979791

Pubmed Central ID

  • 14979791

Electronic International Standard Serial Number (EISSN)

  • 1939-0084

International Standard Serial Number (ISSN)

  • 0735-7044

Digital Object Identifier (DOI)

  • 10.1037/0735-7044.118.1.150


  • eng