Working memory accuracy for multiple targets is driven by reward expectation and stimulus contrast with different...

Area of Science:

• Cognitive Neuroscience
• Neuroscience
• Psychology

Background:

• The brain must filter vast sensory information for working memory.
• Stimulus salience and reward expectations guide this selection, but mechanisms remain unclear.

Purpose of the Study:

• Investigate how priority influences working memory quality during encoding and maintenance.
• Determine the timing and mechanisms of reward cue and salience effects on memory.

Main Methods:

• Manipulated reward cues and stimulus contrast during working memory tasks.
• Assessed working memory accuracy across different phases (encoding, maintenance, retrieval).

Main Results:

• Reward cues enhanced working memory only during the encoding phase.
• Bottom-up stimulus salience affected encoding differently than reward cues, with varying time-courses.
• Previously learned reward associations decayed without reinforcement.

Conclusions:

• Working memory resource allocation is influenced by priority during encoding.
• Selective attention is a critical gating mechanism between sensory systems and working memory.
• Reward and salience exert distinct temporal influences on memory encoding.