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Orienting Attention to Short-Term Memory Representations via Sensory Modality and Semantic Category Retro-Cues.
Kristina C Backer1, Bradley R Buchsbaum2,3, Claude Alain2,3,4,5
1Department of Cognitive and Information Sciences, University of California, Merced, CA 95343 kbacker@ucmerced.edu.
Eneuro
|November 3, 2020
Summary
Reflective attention to memory involves fronto-parietal networks. Brain imaging shows posterior parietal cortex activation for both modality and semantic memory access, with semantic cues engaging a left-lateralized network.
Area of Science:
- Cognitive Neuroscience
- Neuroimaging
Background:
- Attention and memory interactions are crucial for cognition.
- Existing theories suggest a fronto-parietal network for reflective attention to memory.
Purpose of the Study:
- To investigate the neural mechanisms of reflective attention during short-term memory (STM) access.
- To examine how sensory modality and semantic category influence attention-based memory retrieval.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used to study brain activity.
- A retro-cue paradigm with auditory and visual stimuli was employed.
- Participants responded to Modality, Semantic, or Uninformative retro-cues.
Main Results:
- Modality and Semantic retro-cues improved response times compared to Uninformative cues.
- Posterior parietal cortex (PPC) showed overlapping activation for modality- and semantic-based attention.
- Semantic cues activated a left-lateralized fronto-parietal network.
- Dividing attention across modalities increased bilateral PPC activation.
Conclusions:
- Fronto-parietal regions are flexibly recruited for reflective attention based on memory features.
- The PPC plays a key role in both modality- and semantic-based reflective attention.
- Neural mechanisms of attention-memory interaction are modality- and feature-dependent.
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