Spontaneous adaptation explains why people act faster when being imitated

Area of Science:

• Cognitive Psychology
• Social Neuroscience
• Human Motor Control

Background:

• Joint action performance is often attributed to complex cognitive functions.
• Previous research suggested leaders anticipate partners' actions based on response times.

Purpose of the Study:

• To investigate the role of low-level mechanisms in joint action timing.
• To challenge the exclusive attribution of joint action coordination to high-level cognitive processes.

Main Methods:

• Two experiments were conducted involving action leaders and partners performing joint actions.
• Experiment 1 examined leader response times when partners imitated or counterimitated, with leader observation of partner actions.
• Experiment 2 manipulated the relative speed of imitative versus counterimitative actions to test the low-level mechanism hypothesis.

Main Results:

• Leaders acted faster when imitated than counterimitated, but only when they could observe their partner (Experiment 1).
• When imitative actions were made slower than counterimitative actions, leaders' timing reversed, becoming slower when imitated and faster when counterimitated (Experiment 2).

Conclusions:

• Spontaneous temporal adaptation, a low-level mechanism, is a key factor in joint action timing.
• The findings suggest a reconsideration of high-level cognitive explanations for various joint action phenomena.