Modulation of spatial orientation processing by mental imagery instructions: a MEG study of representational momentum

Area of Science:

• Cognitive Neuroscience
• Neuroscience
• Psychology

Background:

• Representational momentum (RM) describes the memory distortion for a halted object's final position in the direction of its prior motion.
• Mental imagery instructions can modulate spatial orientation processing, but their effect on RM is not fully understood.

Purpose of the Study:

• To investigate how mental imagery instructions (picture vs. body rotation) affect spatial orientation processing and representational momentum.
• To explore the neurocognitive mechanisms underlying RM and spatial orientation using magnetoencephalography (MEG).

Main Methods:

• Participants performed a task involving perception and imagination of sea horizon rotation (picture vs. body tilt).
• Behavioral data (reaction time, errors) and brain activity (MEG) were recorded.
• Neurocognitive markers included brain magnetic field strength, spatial distribution, and P200m evoked field latency.

Main Results:

• Perceptual interpretation and extrapolation of visual motion engage fronto-parietal networks and working memory.
• RM effects were observed, simulating gravity's role in rotational equilibrium.
• Modulation of the P200m component indicated spatial orientation processing and incongruity detection.
• Neuromagnetic fields suggested differential attention allocation based on imagery instructions.
• Common neural structures in the right centro-parietal region were implicated in both RM and mental rotation.

Conclusions:

• Mental imagery instructions differentially modulate attentional resources and influence representational momentum.
• Spatial orientation processing and RM share neural resources, particularly in the right centro-parietal cortex.
• Internalizing the virtual body's mass reduces forward shifts in body motion RM compared to picture motion RM.