Three-Dimensional Face Recognition in Mild Cognitive Impairment: A Psychophysical and Structural MR Study

Area of Science:

• Neuroscience
• Cognitive Science
• Medical Imaging

Background:

• Mild cognitive impairment (MCI) increases Alzheimer's dementia risk.
• Visuospatial domain impairments are reported in MCI.
• Previous work linked structure-from-motion (SFM) deficits to visual ventral stream reorganization.

Purpose of the Study:

• Identify structural brain correlates of complex face and object recognition in amnestic MCI.
• Investigate the role of visual streams in 3D SFM perception.

Main Methods:

• Compared 30 MCI patients with 25 controls.
• Used a psychophysical paradigm to discriminate 3D SFM shapes (faces/objects) from scrambled shapes.
• Performed morphometric analysis and cortical thickness assessment.

Main Results:

• MCI patients showed smaller hippocampal volumes.
• Cortical thickness in the right occipital lobe and fusiform regions (face-selective areas) correlated with face recognition performance in MCI.

Conclusions:

• 3D visual integration impairment occurs at the MCI stage, affecting the visual ventral stream and face recognition.
• Observed structure-function correlation highlights a specific role for this pathway in face processing, relevant to MCI and potentially Alzheimer's disease.