Persisting activation in voluntary task switching: it all depends on the instructions

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human Performance

Background:

• Task switching involves cognitive control and can incur performance costs.
• Persisting activation from prior tasks is a hypothesized contributor to switch costs.
• Voluntary task switching introduces complexity due to self-paced, unpredictable sequence selection.

Purpose of the Study:

• To investigate whether persisting activation influences switch costs in voluntary task switching.
• To determine if instructing participants to select unpredictable task sequences eliminates asymmetric switch costs.

Main Methods:

• Participants voluntarily switched between color naming and word naming tasks.
• Two groups were used: one instructed to select unpredictable task sequences, the other not.
• Asymmetric switch cost was measured as an indicator of persisting activation.

Main Results:

• No asymmetric switch cost was observed when participants were instructed to be unpredictable.
• An asymmetric switch cost was observed when participants were not instructed to be unpredictable.
• This suggests that persisting activation in voluntary task switching is limited.

Conclusions:

• Switch costs in voluntary task switching primarily reflect cognitive system reconfiguration time.
• The need to compensate for persisting activation plays a minimal role in voluntary task switching.
• Active inhibition of previously executed tasks is crucial for voluntary task switching efficiency.