Extended tasks elicit complex eye movement patterns

ABSTRACT

Visual perception is an inherently complex task, yet the bulk of studies in the past were undertaken with subjects performing relatively simple tasks under reduced laboratory conditions. In the research reported here, we examined subjects' oculomotor performance as they performed two complex, extended tasks. In the first task, subjects built a model rocket from a kit. In the second task, a wearable eyetracker was used to monitor subjects as they walked to a restroom, washed their hands, and returned to the starting point. For the purposes of analysis, both tasks can be broken down into smaller sub-tasks that are performed in sequence. Differences in eye movement patterns and high-level strategies were observed in the model building and hand-washing tasks. Fixation durations recorded in the model building tasks were significantly shorter than those reported in simpler tasks. Performance in the hand-washing task revealed look-ahead eye movements made to objects well in advance of a subject's interaction with the object. Often occurring in the middle of another task, they provide overlapping temporal information about the environment, providing a mechanism to produce our conscious visual experience.

REFERENCES

• 1: Ballard, D.H., Hayhoe, M.M., and Pelz, J.B. (1995) Memory Representations in Natural Tasks, Journal of Cognitive Neuroscience, 7, 68-82.
• 2: Becket, W., (1991) Saeeades, in Eye Movements, Vol. 8 in Vision and v~sual Dysfunction, R.H.S. Carpenter Ed. CRC Press, Boca Raton.
• 3: CoUewijn, H., Steinman, ILM., Erkelens, C.J., Pizlo, Z., & van der Steen, J. (1992) Effect of freeing the head on eye movement characteristics during three-dimensional shifts of gaze and tracking, Chapter 64 in The Head-Neck Sensory Motor System, Bertboz, A., Graf~ W., & Vidal, P.P., Eds. Oxford University Press.
• 4: Epelboim J., Steinman 1LM., Kowler E., Pizlo Z., Erkelens C.J., Collewijn H. (1997) Gaze-shift dynamics in two kinds of sequential looking tasks. Vision Res. 37: 2597-2607.
• 5: Kowler, E. (1990) The role of visual and cognitive processes in the control of eye movements. In Eye movements and their role in visual and cognitive processes, Kowler, E. Ed. Elsevier Publishers
• 6: Kowler, E., Pizlo, Z., Zhu, G., Erkelens, C.J., Steinman, ILM., & Collewijn, H. (1992) Coordination of head and eyes during the performance of natural (and unnatural) visual tasks. Chapter 65 in The Head-Neck Sensory Motor System, Berthoz, A., Graf, W., & Vidal, P.P., Eds. Oxford University Press.
• 7: Land M.F., Furneaux, S. (1997) The knowledge base of the oculomotor system. Phil Trans R Soc Lend B 352:1231-1239
• 8: Land, M.F., Mennie, N. and Rusted, J. (1998) Eye movements arid the roles of vision in activities of daily living: making a cup of tea. lnvest. Ophthalmol. Visual. Sci. 39:$457 ARVO Abstract 2094.
• 9: O'Regan, J.K. (1992). Solving the "real" mysteries of visual perception: the world as an outside memory. Canadian Journal of Psychology, 46, 461-488.
• 10: Peiz J.B. and M.M. Hayhoe, "The Role of Exoeenlric Reference Frames in the Perception of Visual Direction;" Vision Research, 35:2267-2275 (1995).
• 11: Simons, D. J., & Levin, D. T. (1997). Change blindness. Trends in Cognitive Science, 1, 261-267.
• 12: Viviani, P. (1990) Eye movements in visual search: cognitive, perceptual, and motor control aspects, in Kowler, E. (ed.) Eye movements and their role in visual and cognitive processes. Reviews of Oeulomotor Research V4, Elsevier, 353-383.

INDEX TERMS

Primary Classification:
  H. Information Systems
  H.1 MODELS AND PRINCIPLES

Additional Classification:
  H. Information Systems
  H.5 INFORMATION INTERFACES AND PRESENTATION (I.7)
      H.5.2 User Interfaces (D.2.2, H.1.2, I.3.6)
          Subjects: Interaction styles (e.g., commands, menus, forms, direct manipulation)

General Terms:
Design, Experimentation, Human Factors, Management, Measurement, Performance, Theory

Keywords:
complex tasks, extended tasks, eyetracking, fixation duration, portable/wearable eyetracking, visual perception