What is the intention to move and when does it occur?

Area of Science:

• Neuroscience
• Cognitive Science
• Philosophy of Mind

Background:

• The 1983 Libet experiment challenged the traditional view of conscious intention preceding motor preparation.
• This initiated significant debate on free will, moral responsibility, and the neurophysiology of intention.
• The Bereitschaftspotential (readiness potential) observed in scalp electroencephalography (EEG) precedes reported conscious intent to move.

Purpose of the Study:

• To review the concept of conscious intention and methods for measuring its timing.
• To critically evaluate the interpretation of findings from the Libet experiment and subsequent research.
• To explore the complexities and challenges in pinpointing the precise moment of conscious intention.

Main Methods:

• Review of existing literature on the Libet experiment and related neuroscientific studies.
• Analysis of methodologies used to measure the timing of conscious intention, including the W time.
• Examination of electroencephalographic (EEG) data, specifically the Bereitschaftspotential.

Main Results:

• The Bereitschaftspotential consistently precedes the reported onset of conscious intention in movement tasks.
• The Libet method for determining the timing of conscious intent (W time) has been shown to be inaccurate and potentially misleading.
• Numerous studies indicate significant controversy surrounding the interpretation of the Libet findings.

Conclusions:

• Conscious intention is a multifaceted concept with various underlying aspects.
• While significant progress has been made in understanding the neurophysiology of movement, the precise temporal identification of conscious intention remains an unresolved challenge.
• The interpretation of readiness potentials and subjective timing reports requires careful consideration due to methodological limitations.