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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Sharp-Wave Ripples in Primates Are Enhanced near Remembered Visual Objects.

Timothy K Leonard1, Kari L Hoffman2

  • 1Department of Psychology, Faculty of Health, York University, Toronto, ON M3J 1P3, Canada; Centre for Vision Research, York University, Toronto, ON M3J 1P3, Canada.

Current Biology : CB
|January 3, 2017
PubMed
Summary
This summary is machine-generated.

Sharp-wave ripples (SWRs) in the primate hippocampus increase with object repetition. These neural signals guide search behavior toward remembered objects, linking SWRs to memory in primates.

Keywords:
binding memorychange detectionepisodic memorymonkeyreplayscan pathscene searchspatial attentionvisuospatial memory

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Area of Science:

  • Neuroscience
  • Cognitive Science

Background:

  • The hippocampus is crucial for memory, generating sharp-wave ripples (SWRs) during inactive states.
  • SWRs are linked to memory in rodents but not yet in primates.
  • Recent findings show SWRs during active visual exploration in macaques.

Purpose of the Study:

  • Investigate the role of hippocampal SWRs in primate memory during active scene exploration.
  • Determine if SWRs are associated with memory for objects within scenes in macaques.

Main Methods:

  • Recorded hippocampal SWRs in macaques searching for objects in scenes.
  • Analyzed SWR rate in relation to object presentation frequency.
  • Examined gaze patterns during SWRs relative to target objects.

Main Results:

  • SWR rate increased with repeated object presentations.
  • Gaze during SWRs showed a proximity bias towards target objects with repetition.
  • This bias occurred near the time of object detection for remembered items.

Conclusions:

  • Increased SWR likelihood near remembered objects suggests a link to primate memory.
  • Hippocampal SWRs may contribute to guiding search based on past experiences.
  • This study extends the role of SWRs beyond inactive states to active memory processes in primates.