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Improving short-term memory can be achieved through techniques like chunking and rehearsal. Chunking involves organizing information into larger, more manageable units. This technique is particularly useful for information that exceeds the typical memory span of between five and nine items. For instance, logging into an online account with a password like "ta89vq0179gz" involves grouping letters and numbers into three chunks—ta89, vq01, and 79gz. It makes large amounts of...
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Related Experiment Video

Updated: Jul 9, 2025

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Cortical time-course of evidence accumulation during semantic processing.

Gayane Ghazaryan1, Marijn van Vliet2, Lotta Lammi2

  • 1Department of Neuroscience and Biomedical Engineering, Aalto University, P.O. Box 12200, FI-00076, Aalto, Finland. gayane.ghazaryan@aalto.fi.

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The brain gradually builds concept information from sensory input, reaching a recognition plateau. This process shows individual timing variations in visual and semantic information processing.

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Area of Science:

  • Cognitive Neuroscience
  • Computational Neuroscience
  • Psycholinguistics

Background:

  • Mental concept representation is crucial for understanding the world and communication.
  • The brain identifies objects by matching sensory input to conceptual information.

Purpose of the Study:

  • To investigate the temporal dynamics of concept representation and access in the brain.
  • To explore how visual and semantic information are processed over time during object recognition.

Main Methods:

  • Utilized magnetoencephalography (MEG) to record brain activity.
  • Applied machine learning techniques to analyze neural data.
  • Employed a silent picture naming task to elicit cognitive processes.

Main Results:

  • Brain activity patterns show gradual information accumulation across different processing levels.
  • A plateau in information processing was observed, signifying concept recognition.
  • The timing of this plateau varied significantly across individuals and feature models.

Conclusions:

  • The brain dynamically processes visual and semantic information over time to access concepts.
  • Individual differences and feature complexity influence the speed of object recognition and semantic processing.
  • This study provides insights into the temporal unfolding of cognitive processes underlying concept access.