Space-related confabulations after right hemisphere damage.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neurology

Background:

• Confabulations are typically considered memory distortions inconsistent with a patient's history.
• Behavioral anomalies resembling confabulations can manifest in individuals with right hemisphere damage (RHD).
• These RHD-associated confabulations relate to personal, peripersonal, or extrapersonal space.

Purpose of the Study:

• To review and analyze confabulatory phenomena occurring after right hemisphere damage.
• To explore the potential underlying mechanisms of these spatial and personal confabulations.
• To propose a theoretical framework explaining these confabulations in RHD.

Main Methods:

• Review of clinical cases and literature concerning confabulations in right brain-damaged patients.
• Analysis of specific phenomena such as anosognosia, somatoparaphrenia, misoplegia, and reduplicative paramnesia.
• Theoretical integration of findings to explain the role of interhemispheric communication.

Main Results:

• Right hemisphere damage can lead to unawareness of deficits (anosognosia), limb ownership denial (somatoparaphrenia), and limb hostility (misoplegia).
• Patients may experience phantom limbs or confabulate about neglected visual space and location (reduplicative paramnesia).
• These confabulations involve personal, peripersonal, and extrapersonal spatial domains.

Conclusions:

• Confabulatory behaviors in RHD are distinct from typical memory confabulations and are linked to spatial awareness and body representation.
• These phenomena may represent the left hemisphere's attempt to reconcile aberrant sensory input from the damaged right hemisphere.
• Understanding these confabulations offers insights into interhemispheric interactions and the neural basis of spatial cognition and self-awareness.