Disambiguation of two-tone images aligns object representations in the EEG

After visual disambiguation, EEG responses to learned two-tone images in 17 healthy participants align more closely with their photo counterparts, peaking at 350 ms.

• Why it matters: It addresses whether EEG signals for visual objects reflect conceptual knowledge or instead track regularities in low-level physical image features.
• What they did: Participants viewed two-tone images before and after disambiguation using corresponding photographs while EEG was recorded to separate learned image concepts from physical properties.
• The result: The alignment emerged ~100 ms after onset and peaked at 350 ms, but there was no evidence for generalization to semantic category or spontaneous recognition without explicit disambiguation.

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