An orienting response is not enough: Bivalency not infrequency causes the bivalency effect

Area of Science:

• Cognitive psychology
• Human-computer interaction
• Neuroscience

Background:

• Task switching can be impaired by stimuli relevant to multiple tasks (bivalent stimuli).
• This performance slowing is termed the bivalency effect.
• Previous research suggests this effect may relate to orienting responses to infrequent stimuli.

Purpose of the Study:

• To investigate if the bivalency effect arises from an orienting response to infrequent bivalent stimuli.
• To differentiate the impact of infrequent bivalent stimuli from infrequent univalent stimuli on subsequent performance.

Main Methods:

• Participants performed a task-switching paradigm.
• The study compared performance after infrequent bivalent stimuli versus infrequent univalent stimuli.
• Reaction times and error rates were measured to assess performance slowing.

Main Results:

• A significant and long-lasting performance slowing was observed following bivalent stimuli, confirming the bivalency effect.
• Infrequent univalent stimuli also caused a performance slowing, but it was smaller and shorter-lived.
• The pattern of results suggests the bivalency effect is not solely due to stimulus infrequency.

Conclusions:

• The bivalency effect is not merely an orienting response to infrequent stimuli.
• Conflict induced by bivalent stimuli, potentially through episodic binding with a demanding context, is the likely cause.
• This finding advances our understanding of cognitive control during task switching.