Independent reference frames in human spatial memory: body-centered and environment-centered coding in near and far...

Area of Science:

• Cognitive Neuroscience
• Human Spatial Navigation
• Perception and Action

Background:

• Human spatial experience relies on multiple reference frames, including body-centered and environment-centered systems.
• Understanding how these distinct spatial coding systems interact is crucial for cognitive neuroscience.

Purpose of the Study:

• To provide the first clear behavioral evidence of a dissociation between body-centered and environment-centered spatial coding in human adults.
• To investigate how interference within specific spatial reference frames affects spatial memory recall.

Main Methods:

• Participants were seated in a rotating chair with eyes closed and asked to point to remembered auditory targets.
• Targets and distractor locations were presented and recalled under rotation, fixed to either body-centered or environment-centered coordinates.
• Memory performance was assessed based on the spatial reference frame of both target and distractor locations.

Main Results:

• Memory for target locations was significantly impaired when distractor locations shared the same spatial reference frame (body-centered or environment-centered) as the targets.
• This impairment occurred irrespective of the proximity of target and distractor locations.
• Distractor locations presented in a different reference frame than the target had minimal to no impact on memory recall.

Conclusions:

• Human spatial memory processing exhibits a behavioral dissociation between body-centered and environment-centered reference frames.
• Interference effects in spatial memory are specific to the congruence of reference frames between targets and distractors.
• This finding supports the existence of distinct neural mechanisms for processing body-relative and world-relative spatial information.