Biomedical subjects

Ryan Mruczek

Publications and source records attributed to Ryan Mruczek.

2 recordsLinked to original sources

PubMed2003

Visual memory and motor planning in a natural task.

This paper investigates the temporal dependencies of natural vision by measuring eye and hand movements while subjects made a sandwich. The phenomenon of change blindness suggests these temporal dependencies might be limited. Our observations are largely consistent with this, suggesting that much natural vision can be accomplished with "just-in-time" representations. However, we also observe several aspects of performance that point to the need for some representation of the spatial structure of the scene that is built up over different fixations. Patterns of eye-hand coordination and fixation sequences suggest the need for planning and coordinating movements over a period of a few seconds. This planning must be in a coordinate frame that is independent of eye position, and thus requires a representation of the spatial structure in a scene that is built up over different fixations.

Fixation, Ocular↗

PubMed2002

Visual short-term memory and motor planning.

Despite extensive experimental work showing that memory for visual information in prior fixations is limited, the nature and content of the information maintained across fixations, when vision functions in its natural context, is not well determined. To gain insight into what memory representations might be needed to support vision in the natural world, we examined eye and hand movements while subjects made a sandwich and while they copied a toy model in a virtual environment. Patterns of eye-hand coordination and fixation sequences suggest the need for planning and coordinating movements over a period of a few seconds. Since the movement plan is initiated when the eye is in a different position from that when the movement itself is made, the planning must be in a coordinate frame that is independent of eye position. Movement planning thus requires a representation of the spatial structure in a scene that is built up over different fixations.

Fixation, Ocular↗