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Working memory refers to a combination of components, including short-term memory and attention, that allow an individual to hold information temporarily as we perform cognitive tasks. It is an essential cognitive function that enables the execution of complex tasks such as problem-solving, comprehension, and reasoning. Unlike short-term memory, which simply involves the storage of information for a brief period, working memory involves the active manipulation and processing of this...
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The cerebellum, while traditionally associated with motor control, also plays a crucial role in memory, particularly in procedural memory, which involves learning motor tasks that become automatic through repetition. For example, studies have shown that when the cerebellum is damaged, individuals or animals lose the ability to learn conditioned motor responses, such as the conditioned eye-blink response in classical conditioning experiments with rabbits. This study demonstrates the...
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Oscillations without cortex: Working memory modulates brainwaves in the endbrain of crows.

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Bird brains without a cortex show brain wave patterns similar to mammals during complex tasks. Oscillatory dynamics in beta and gamma frequencies are crucial for working memory, suggesting convergent evolution of cognitive functions.

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Area of Science:

  • Neuroscience
  • Comparative Cognition
  • Avian Brain

Background:

  • Complex cognition relies on coordinated network activity, often modeled using mammalian cortical organization.
  • Avian brains possess higher associative regions lacking cortical layering, yet exhibit similar cognitive functions to mammals.
  • Local field potentials (LFPs) are key indicators of neuronal coordination in cognitive processes.

Purpose of the Study:

  • To investigate LFP signatures associated with working memory in crows, a species with complex cognition but non-cortical brain structures.
  • To compare avian LFP dynamics with those observed in primate prefrontal cortex models of cognition.
  • To explore the role of specific oscillatory frequencies in avian working memory.

Main Methods:

  • Recorded LFPs in the avian prefrontal cortex equivalent of crows during a demanding working memory task.
  • Analyzed LFP data for modulations related to working memory load and item location.
  • Examined specific frequency bands (beta and gamma) and oscillatory bursts for cognitive information.

Main Results:

  • LFP signatures modulated by working memory were identified in crows.
  • Beta and gamma frequency bands contained information about target item location and were affected by working memory load.
  • Observed bursts in beta and gamma frequencies, aligning with 'activity silent' working memory models.

Conclusions:

  • The avian associative pallium can generate LFP signatures similar to primates, despite lacking cortical organization.
  • Oscillatory dynamics in beta and gamma frequencies are critically involved in avian cognitive processing and working memory.
  • These findings suggest that oscillatory dynamics play a fundamental role in complex cognition, evolving convergently across species.