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Related Experiment Video

Updated: Apr 5, 2026

Multiscale Investigations of Cortical Processing by Integrating Laminar Polytrodes and Optogenetics with Micro Electrocorticography in Rodents

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Stimulus Load and Oscillatory Activity in Higher Cortex.

Simon Kornblith¹, Timothy J Buschman², Earl K Miller¹

¹Department of Brain and Cognitive Sciences, The Picower Institute for Learning and Memory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Cerebral Cortex (New York, N.Y. : 1991)

|August 20, 2015

Summary

This summary is machine-generated.

Neural oscillations help manage multiple visual stimuli in working memory. Higher frequencies aid stimulus encoding, while lower frequencies support memory recall and top-down control.

Keywords:

frontal eye fields lateral intraparietal area power prefrontal cortex synchrony working memory

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Recording Spatially Restricted Oscillations in the Hippocampus of Behaving Mice

Recording Spatially Restricted Oscillations in the Hippocampus of Behaving Mice

Published on: July 1, 2018

Area of Science:

Neuroscience
Cognitive Science
Computational Neuroscience

Background:

Simultaneously perceiving and remembering multiple objects is crucial for navigating complex environments.
Oscillatory neural dynamics are increasingly implicated in the cognitive demands of multitasking and working memory.

Purpose of the Study:

To investigate the role of neural oscillations in maintaining multiple visual stimuli in working memory.
To differentiate the contributions of various frequency bands and brain regions to working memory load.

Main Methods:

Recorded local field potentials from the lateral intraparietal area, frontal eye fields, and lateral prefrontal cortex in monkeys.
Monkeys maintained variable numbers of visual stimuli in working memory.
Analyzed power and synchrony in different frequency bands (e.g., gamma, beta, theta) in relation to memory load.

Main Results:

Higher-frequency power (50-100 Hz) increased with contralateral stimulus load during encoding.
Lower-frequency power (8-50 Hz) decreased with total stimulus load during encoding and increased with contralateral load during memory delay.
Higher-frequency synchrony increased with load, while beta synchrony showed an inverse relationship with power.

Conclusions:

Lower-frequency oscillations may support top-down control and sustained memory representation.
Higher-frequency oscillations likely contribute to bottom-up stimulus processing and encoding.
Neural oscillations dynamically adjust to working memory demands, reflecting distinct roles in processing and maintenance.