Using Rescorla's truly random control condition to measure truly exogenous covert orienting

Area of Science:

• Cognitive Psychology
• Neuroscience
• Visual Attention

Background:

• Exogenous covert orienting studies use spatially uninformative peripheral cues.
• A biphasic pattern (attentional capture and inhibition of return) is typically observed.
• Temporal contingency between cues and targets may confound previous findings.

Purpose of the Study:

• To investigate if the biphasic pattern in exogenous covert orienting persists when peripheral cues are temporally uninformative.
• To isolate the effects of spatial cueing from temporal contingencies.

Main Methods:

• Utilized a truly random control condition to ensure temporal uninformaticity of peripheral stimuli.
• Varied cue-target onset asynchrony (CTOA) to examine the time course of cue influence.
• Measured performance at cued and uncued locations.

Main Results:

• The prototypical biphasic pattern was observed even with temporally uninformative peripheral stimuli.
• Both attentional capture (shorter CTOA) and inhibition of return (longer CTOA) effects were present.
• This suggests these phenomena are not solely dependent on temporal cue-target contingencies.

Conclusions:

• The findings challenge the notion that temporal contingencies are necessary for attentional capture and inhibition of return.
• Exogenous covert orienting effects may be more robust and less dependent on endogenous temporal attention than previously thought.
• Re-evaluates the mechanisms underlying attentional orienting in response to peripheral stimuli.