The contents of visual memory are only partly under volitional control

Area of Science:

• Cognitive Psychology
• Neuroscience
• Visual Perception

Background:

• The process of visual memory formation during naturalistic viewing, involving eye movements (saccades), is not fully understood.
• It remains unclear whether visual information is automatically stored or if selective control mechanisms prevent unwanted information from entering memory.

Purpose of the Study:

• To investigate whether visual information is automatically encoded into visual memory during saccades.
• To determine if top-down control, including attention and eye movements, can prevent the encoding of ignored visual stimuli into memory.

Main Methods:

• Five experiments were conducted using sequential presentation of visual shapes or faces.
• Participants were instructed to remember targets while ignoring distractors over a 1-second delay.
• Experimental conditions manipulated the ability to prepare for stimuli and the coupling of attention with eye movements.

Main Results:

• Distractors were consistently retained in visual memory across different stimulus categories.
• Preparation for targets or distractors did not prevent distractor intrusion into memory.
• When eye movements were constrained, distractors were encoded into memory.
• When attention and eye movements could select targets, distractor encoding into memory was prevented.

Conclusions:

• Visual memory encoding appears to be a largely automatic process during saccades.
• Top-down control mechanisms are insufficient on their own to filter unwanted information from visual memory.
• The interplay between attention, eye movements, and visual memory encoding requires further investigation.