Unexpected abrupt onsets can override a top-down set for color

Area of Science:

• Cognitive Psychology
• Neuroscience
• Visual Attention

Background:

• Spatial attention is typically guided by observer goals (top-down control).
• However, unexpected salient stimuli may involuntarily capture attention, overriding these goals.
• The nature of stimuli that can penetrate top-down attentional set requires further investigation.

Purpose of the Study:

• To investigate whether infrequent salient stimuli can override top-down attentional control.
• To determine if stimulus modality (onset vs. color) influences attentional capture.
• To test the cognitive impenetrability of attentional capture by infrequent stimuli.

Main Methods:

• Utilized spatial cuing and rapid serial visual presentation (RSVP) paradigms.
• Manipulated the presentation frequency of salient, irrelevant onset and color stimuli.
• Measured behavioral responses (e.g., target report accuracy) to assess attentional capture.

Main Results:

• Infrequent onset precues captured spatial attention for color targets, but infrequent color singleton precues did not capture attention for onset targets.
• In an RSVP task, infrequent peripheral onsets impaired the detection of a color target, indicating attentional capture.
• These findings demonstrate that infrequent onsets can override a top-down set for color.

Conclusions:

• Infrequent onsets represent a unique class of stimuli.
• These stimuli can elicit cognitively impenetrable, involuntary shifts of spatial attention.
• This challenges the notion that attentional capture is always contingent on observer goals.