Monocular channels have a functional role in phasic alertness and temporal expectancy.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Visual Processing

Background:

• The neocortex has been traditionally associated with phasic alertness and temporal expectancy.
• The role of subcortical structures in these cognitive processes remains less understood.

Purpose of the Study:

• To investigate the functional involvement of subcortical, monocular mechanisms in phasic alertness and temporal expectancy.
• To differentiate the roles of these mechanisms using an eye-of-origin manipulation.

Main Methods:

• Participants performed target detection tasks with cue-target eye-of-origin manipulation.
• Phasic alertness was assessed using alerting cues.
• Temporal expectancy was manipulated by varying cue-target intervals.

Main Results:

• Alerting effects lasted longer when cues and targets were presented to the same eye, indicating subcortical involvement in phasic alertness.
• Temporal expectancy was modulated when cues and targets were presented to the same eye, showing subcortical roles in temporal expectancy.

Conclusions:

• Monocular channels within the visual stream are functionally involved in both phasic alertness and temporal expectancy.
• Subcortical regions are critical for higher cognitive functions like temporal expectancy, warranting further investigation.