Phasic Alertness is Unaffected by the Attentional Set for Orienting.

Area of Science:

• Cognitive psychology
• Neuroscience
• Attention research

Background:

• Phasic alertness and spatial orienting cues enhance behavioral performance.
• Traditionally, these effects were attributed to separate attention systems.
• Recent research questions the independence of alerting and orienting systems.

Purpose of the Study:

• To investigate if the attentional set for orienting influences the effectiveness of phasic alertness.
• To determine if alerting and orienting systems are interdependent or independent.

Main Methods:

• Three experiments involved participants performing speeded visual stimulus classification.
• Participants were presented with orienting cues (predicting location), alerting cues (neutral location), or no cues.
• The attentional set for orienting was manipulated by using informative or uninformative orienting cues.

Main Results:

• Alerting generally enhanced performance across conditions.
• Alerting effects were not significantly affected by the informativeness of the orienting cues.
• This indicates alerting is independent of the attentional set for orienting.

Conclusions:

• Alerting does not rely on the attentional set governing orienting based on cue informativeness.
• Findings support a dissociation between the mechanisms of phasic alertness and spatial attentional orienting.
• This provides evidence for distinct neural underpinnings of these attention processes.