Visual short-term memory binding and attentional processes during object-scene integration are preserved in mild...

Area of Science:

• Cognitive Neuroscience
• Visual Perception
• Human Aging

Background:

• Binding is crucial for object representation and is impaired in dementia, affecting visual working memory (VWM).
• Previous research often uses abstract object arrays, limiting understanding of VWM binding in realistic contexts.
• Investigating VWM binding across the lifespan and in naturalistic settings is essential.

Purpose of the Study:

• To examine how object saliency and semantic consistency affect VWM binding in naturalistic scenes.
• To determine the role of overt attention in VWM binding across different age groups and cognitive statuses.
• To explore the impact of cognitive decline on object-scene integration mechanisms.

Main Methods:

• Utilized an eye-tracking change detection task with younger adults, healthy older adults, and individuals with Mild Cognitive Impairment (MCI).
• Presented participants with naturalistic scenes containing semantically consistent and inconsistent objects.
• Analyzed change detection accuracy based on object properties (saliency, consistency) and eye movement patterns (fixation duration, latency).

Main Results:

• Semantically inconsistent objects were prioritized during encoding, improving change detection across all groups.
• High object saliency reduced the benefit of inconsistency and harmed detection accuracy with longer initial fixation latencies.
• Longer fixation durations on critical objects aided recognition, while delayed or scattered attention impaired detection.

Conclusions:

• Efficient attentional control supports VWM binding, even with age-related cognitive decline or Mild Cognitive Impairment.
• Preserved object-scene integration mechanisms can compensate for cognitive deficits in naturalistic contexts.
• Findings challenge generalized semantic memory impairment notions in early dementia stages and emphasize attention's role in VWM binding.