Obligatory encoding of task-irrelevant features depletes working memory resources.

Area of Science:

• Cognitive Neuroscience
• Psychology

Background:

• Selective attention is considered the gateway to visual working memory (VWM).
• The voluntary control over which object features enter VWM is debated.
• VWM is a limited resource, with fidelity decreasing as memory load increases.

Purpose of the Study:

• To investigate whether task-irrelevant features are encoded into VWM.
• To determine if attending to or storing one feature automatically encodes all features.
• To examine the voluntary control over VWM maintenance.

Main Methods:

• Used changes in recall precision to probe VWM encoding.
• Manipulated task-irrelevant features and interpolated tasks (orientation/color matching).
• Assessed recall precision for color and orientation under different task conditions.

Main Results:

• Recall precision improved when task-irrelevant features were removed.
• Knowledge of probed features did not enhance recall over memorizing all features.
• Interference occurred when attending to or ignoring features, but not when the task preceded memory array.
• Encoding appears automatic, while maintenance is voluntary.

Conclusions:

• Storing or attending to one feature automatically encodes all features, consuming VWM resources.
• VWM maintenance is voluntary, allowing resource reallocation for new information.
• Findings clarify the interplay between attention, automatic encoding, and voluntary control in VWM.