Task demands modulate pre-stimulus alpha frequency and sensory template during bistable apparent motion perception.

Area of Science:

• Cognitive Neuroscience
• Neuroscience
• Psychology

Background:

• Top-down attention influences perception by modulating neural activity and sensory templates.
• Prolonged task states with singular goals differ from typical cue-target paradigms.
• The modulation of neural signals and sensory templates during sustained tasks is not well understood.

Purpose of the Study:

• To investigate how sustained task demands modulate prestimulus neural signals and sensory templates.
• To understand the mechanisms by which the brain biases perception toward a preferred percept during prolonged tasks.

Main Methods:

• Utilized electroencephalogram (EEG) in human subjects.
• Manipulated sustained task demands toward one of two percepts in a bistable Ternus display.
• Analyzed prestimulus peak alpha frequency and employed time-resolved decoding.

Main Results:

• Sustained task demands modulated prestimulus peak alpha frequency, affecting temporal integration.
• Neural representations were biased toward preferred percepts after stimulus presentation.
• Sensory templates emerged pre-stimulus, anticipating preferred percepts before sufficient sensory evidence.

Conclusions:

• Sustained task demands modulate both prestimulus alpha frequency and sensory templates.
• These modulations ultimately bias subjective perception toward the preferred percepts.
• The brain actively prepares for expected sensory inputs during prolonged tasks.