Keeping an eye on serial order: Ocular movements bind space and time

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human Memory

Background:

• Understanding how the brain accesses and processes ordered information is crucial for cognitive science.
• The role of visuospatial attention in verbal memory retrieval remains an area of active investigation.

Purpose of the Study:

• To investigate whether retrieving serially-ordered verbal memories engages overt visuospatial attentional resources.
• To explore the spatial encoding of serial order in memory.

Main Methods:

• A three-phase behavioral study involving sequential presentation of single digits.
• Measurement of participants' spontaneous eye movements during recognition and verbal recall tasks.
• Analysis of inspection times and ocular movement patterns in relation to memory retrieval.

Main Results:

• Retrieval of serially-ordered information is mediated by spontaneous ocular movements.
• Accessing middle items in a memorized sequence demands greater overt attentional resources and longer inspection times.
• Evidence suggests a left-to-right spatial encoding of serial order, indicated by eye movement deviations.

Conclusions:

• Overt spatial attention plays a mediating role in scanning representations of serial order.
• The findings support a link between visuospatial attention and the retrieval of sequential verbal memories.