Spontaneous Necker-cube reversals may not be that spontaneous

Area of Science:

• Neuroscience
• Cognitive Psychology
• Visual Perception

Background:

• Perceptual reversals of ambiguous figures, like the Necker cube, are typically perceived as spontaneous.
• Theoretical models suggest neural representation destabilization precedes these perceptual shifts.
• Understanding the neural correlates of perceptual destabilization is key to predicting reversals.

Purpose of the Study:

• To investigate Electroencephalogram (EEG) correlates of perceptual destabilization preceding Necker cube reversals.
• To determine if neural activity can predict spontaneous perceptual reversals.
• To compare neural patterns during endogenous vs. exogenous perceptual reversals.

Main Methods:

• Presented ambiguous Necker cubes and recorded EEG during spontaneous reversals.
• Used disambiguated cubes to induce exogenous reversals for comparison.
• Analyzed EEG data from 1 second before to during perceptual reversal events.

Main Results:

• Significant EEG differences between reversal and stability trials emerged 1 second before spontaneous Necker cube reversals.
• Maximal EEG differences were observed around 890 ms prior to reversal (p = 7.59 × 10^-6, Cohen's d = 1.35).
• No comparable EEG patterns were found for exogenously induced reversals.

Conclusions:

• EEG patterns indicate neural destabilization precedes spontaneous Necker cube reversals.
• Perceptual reversals are not entirely spontaneous, with destabilization occurring over a longer timescale.
• These findings offer predictive markers for perceptual shifts in ambiguous figure perception.