Neural Dynamics of Serial Dependence in Numerosity Perception.

Area of Science:

• Cognitive Neuroscience
• Visual Perception

Background:

• Serial dependence stabilizes visual perception by biasing current stimuli towards previously seen ones.
• A neural signature of serial dependence in numerosity perception emerges early in processing.
• It remains unknown if this neural signature persists beyond initial perceptual stages.

Purpose of the Study:

• To investigate the neural dynamics of serial dependence in numerosity perception.
• To determine if the neural signature of serial dependence is retained after initial processing.
• To explore the persistence of biased neural representations.

Main Methods:

• Electroencephalography (EEG) recording during a numerosity discrimination task.
• Introduction of a task-irrelevant stimulus to induce serial dependence.
• Perturbation (pinging) of neural networks to quantify hidden memory states.

Main Results:

• A neural signature of serial dependence was observed early in brain signals, shortly after stimulus onset.
• Later neural perturbations successfully reactivated the biased neural representation.
• This indicates the persistence of the serial dependence signature.

Conclusions:

• The neural signature of serial dependence in numerosity perception is not transient.
• Biased neural representations induced by serial dependence are preserved over extended periods.
• This provides empirical evidence for the long-term stability of serial dependence effects in neural representations.