Enhanced negative slope of the readiness potential preceding a target force production task

Hiroaki Masaki*, Noriyoshi Takasawa, Katuo Yamazaki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


Readiness potentials (RPs) preceding a trigger pulling movement were recorded in 9 right-handed male subjects. We investigated two tasks, non- purposive and purposive movement tasks. In this study we defined simple trigger pull as non-purposive, and target force production by pulling the trigger as purposive. In the non-purposive task, the subjects were instructed to pull the trigger at their own pace and at an easily-exerted force level. After two sessions in the non-purposive movement task, the subjects were submitted to the purposive movement task, and were requested to pull the trigger in an attempt to produce target force, the range of which was decided individually on the basis of mean force level in the second session of the non-purposive movement task. The RP preceding the purposive movement was larger than that preceding the non-purposive movement. In addition, enhancement of the RP was specific to the negative slope (NS'). Since neither peak force nor time to peak force of the movement differed in the two tasks, it was concluded that the increased NS' was due to a psychological change associated with execution of the purposive movement.

Original languageEnglish
Pages (from-to)390-397
Number of pages8
JournalElectroencephalography and Clinical Neurophysiology - Evoked Potentials
Issue number4
Publication statusPublished - 1998 Jul


  • Negative slope
  • Psychological aspect
  • Purposive movement
  • Readiness potential
  • Trigger pull

ASJC Scopus subject areas

  • Neuroscience(all)
  • Clinical Neurology


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