A clockwork orange: compensation opposing momentum in memory for location

Area of Science:

• Cognitive Neuroscience
• Psychology

Background:

• Libet's (1983, 1985) clock-watching task suggests motor cortex activity precedes conscious awareness of action initiation.
• Joordens et al. (2002) identified a bias in temporal judgment within this task, attributing it to motion cues similar to representational momentum.
• The reliability of clock-watching tasks for measuring action initiation timing is debated.

Purpose of the Study:

• To investigate the influence of response methods on temporal judgment biases in action initiation tasks.
• To explore the presence and nature of biases in action initiation timing.
• To propose and test a compensation process that may oppose observed biases.

Main Methods:

• Experiment 1: Compared temporal-order judgments with mouse-click responses in a clock-watching task.
• Subsequent experiments: Tested a hypothesis of an opposing compensation process influencing bias.
• Utilized procedural parallels with representational momentum research.

Main Results:

• The temporal judgment bias observed in previous studies disappeared when using a mouse-click response.
• This disappearance was unexpected, as procedural elements linked to representational momentum remained.
• Evidence suggests a bias is present but counteracted by an opposing compensation mechanism.

Conclusions:

• The mouse-click response method may mitigate biases found in traditional temporal-order judgments.
• A compensatory process likely influences the perception of action initiation timing.
• Findings have implications for understanding representational momentum and the validity of clock-watching tasks.