Somatosensory prior entry.

Area of Science:

• Neuroscience
• Perception Psychology
• Cognitive Science

Background:

• Perceived timing of sensory events can differ from actual timing.
• Spatial attention influences sensory processing, but its effect on somatosensory timing is less understood.
• Previous studies on attention and timing are confounded by response biases.

Purpose of the Study:

• To investigate how spatial attention affects the perceived timing of somatosensory stimuli.
• To determine if attended somatosensory stimuli are perceived as occurring earlier than unattended ones.
• To examine whether exogenous and endogenous attention have differential effects on somatosensory timing perception.

Main Methods:

• Participants judged the temporal order of two taps delivered to opposing hands at different elevations.
• Spatial attention was manipulated using exogenous (left/right hand taps) or endogenous (central symbolic cues) cuing.
• A vertical discrimination task, orthogonal to attentional manipulation, controlled for response biases.

Main Results:

• Attended somatosensory stimuli were perceived as occurring significantly earlier than unattended stimuli.
• The speeding-up effect of attention on perceived timing was larger for exogenous than for endogenous attention.
• This finding aligns with previous research on visual stimuli.

Conclusions:

• Spatial attention modulates the perceived timing of somatosensory events, making attended stimuli appear faster.
• The results suggest a modality-independent mechanism underlying attention's effect on temporal perception.
• This phenomenon may be a fundamental aspect of the human perceptual system.