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Expectations impact short-term memory through changes in connectivity between attention- and task-related brain
Christopher Sinke1, Katarina Forkmann2, Katharina Schmidt3
1Department of Neurology, University Medical Center Hamburg-Eppendorf, Germany; Department of Psychiatry, Social Psychiatry and Psychotherapy, Hannover Medical School, Germany.
Summary
Expectations significantly influence cognitive task performance, particularly short-term memory. Positive expectations enhance brain activity and connectivity in areas related to attention, even during painful stimuli.
Area of Science:
- Cognitive Neuroscience
- Neuroimaging
Background:
- Expectations are known to influence perception.
- The impact of expectations on cognitive functions, such as task performance, is less understood.
- Neuroimaging studies are crucial for elucidating these neural mechanisms.
Purpose of the Study:
- To investigate the role of expectations on cognitive task performance using functional magnetic resonance imaging (fMRI).
- To explore the underlying neural mechanisms associated with expectation effects on performance under painful stimulation.
Main Methods:
- 43 healthy participants were divided into two groups with differing expectations about pain's effect on performance.
- Participants underwent fMRI while performing a Rapid Serial Visual Presentation (RSVP) task with and without painful heat stimulation.
- Expectations were manipulated using verbal instructions regarding pain's impact on performance.
Main Results:
- Short-term memory performance demonstrated an interaction between painful stimulation and expectation.
- Positive expectations led to greater neural activation in the right inferior parietal cortex (IPC) during pain compared to negative expectations.
- The IPC showed altered functional connectivity with the left inferior occipital cortex under pain, dependent on expectancy.
Conclusions:
- Individual expectations can modulate cognitive performance in visual short-term memory tasks.
- These modulations are linked to changes in brain activity and functional connectivity within attentional and task-performance networks.
- Expectancy effects on cognition highlight the brain's dynamic processing capabilities.
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