Influence of Temporal Expectations on Response Priming by Subliminal Faces

Area of Science:

• Cognitive Neuroscience
• Neuroimaging
• Psychology

Background:

• Unconscious processes are typically considered immune to attentional control.
• Recent research indicates temporal attention can modulate subliminal information processing.

Purpose of the Study:

• To investigate the neural mechanisms by which temporal attention influences the processing of subliminal (masked) faces.
• To examine how attention affects response priming and brain activity during a face perception task.

Main Methods:

• Functional magnetic resonance imaging (fMRI) with a stringent masking paradigm.
• Participants performed a gender decision task on visible target faces preceded by masked prime faces (varying in gender and emotion).
• Temporal attention was manipulated by instructing participants to anticipate targets at early or late time points.

Main Results:

• Temporal attention modulated response priming by masked faces, even with incongruent gender information.
• Gender-congruent primes facilitated responses irrespective of attention; incongruent primes reduced accuracy when attended.
• Brain activity in fronto-parietal attention networks increased with unexpected/incongruent primes, while fusiform cortex showed higher activation with expected/congruent primes.

Conclusions:

• Temporal attention can significantly influence the processing of subliminal facial information, integrating it based on task relevance.
• Task-congruent information enhances response priming even without directed temporal attention.
• Neural evidence supports the role of attention in modulating both executive control and perceptual processing of unconscious stimuli.