title: "Graspability" of objects affects gaze patterns during perception and action tasks.
abstract: When grasping an object, our gaze marks key positions to which the fingertips are directed. In contrast, eye fixations during perceptual tasks are typically concentrated on an object's centre of mass (COM). However, previous studies have typically required subjects to either grasp the object at predetermined sites or just look at computer-generated shapes "as a whole". In the current study, we investigated gaze fixations during a reaching and grasping task to symmetrical objects and compared these fixations with those made during a perceptual size estimation task using real (Experiment 1) and computer-generated objects (Experiment 2). Our results demonstrated similar gaze patterns in both perception and action to real objects. Participants first fixated a location towards the top edge of the object, consistent with index finger location during grasping, followed by a subsequent fixation towards the object's COM. In contrast, during the perceptual task to computer-generated objects, an opposite pattern in fixation locations was observed, where first fixations were closer to the COM, followed by a subsequent fixation towards the top edge. Even though differential fixation patterns were observed between studies, the area in which these fixations occurred, between the centre of the object and top edge, was the same in all tasks. These results demonstrate for the first time consistencies in fixation locations across both perception and action tasks, particularly when the same type of information (e.g. object size) is important for the completion of both tasks, with fixation locations increasing relative to the object's COM with increases in block height.
authors: Perception and Action Lab, Department of Psychology, University of Manitoba, Winnipeg, Canada. umrhode@cc.umanitoba.ca
authors: Loni
authors: L
authors: Desanghere
authors: J J
authors: JJ
authors: Marotta
references: Neuropsychologia. 2000;38(1):93-110
references: 10617294
references: Neuropsychologia. 2000;38(4):520-4
references: 10683402
references: Cereb Cortex. 2002 Mar;12(3):234-45
references: 11839598
references: Neuropsychologia. 2009 May;47(6):1476-82
references: 19114051
references: Neuropsychologia. 2007 Apr 9;45(8):1939-47
references: 17240408
references: J Vis. 2003;3(1):49-63
references: 12678625
references: Neuropsychologia. 1997 May;35(5):717-24
references: 9153034
references: Nature. 1996 Jun 6;381(6582):520-2
references: 8632824
references: Brain Cogn. 2001 Feb;45(1):52-63
references: 11161362
references: J Vis. 2008 May 20;8(7):5.1-11
references: 19146238
references: J Mot Behav. 2004 Sep;36(3):245-52
references: 15262621
references: Vision Res. 1995 Jun;35(12):1741-54
references: 7660582
references: J Vis. 2009 Jan 16;9(1):18.1-24
references: 19271888
references: Neuropsychologia. 2003;41(9):1262-71
references: 12753965
references: Vision Res. 2003 Jul;43(15):1637-53
references: 12798146
references: Exp Brain Res. 2007 Jul;180(3):415-20
references: 17310376
references: Neuropsychologia. 1980;18(4-5):491-8
references: 6777712
references: Trends Cogn Sci. 2005 Apr;9(4):188-94
references: 15808501
references: Vision Res. 1999 Aug;39(17):2929-46
references: 10492819
references: Neuropsychologia. 1988;26(5):741-5
references: 3211292
references: J Neurosci. 2001 Sep 1;21(17):6917-32
references: 11517279
references: Cogn Psychol. 1982 Apr;14(2):143-77
references: 7083801
references: Neuropsychologia. 1971 Mar;9(1):97-113
references: 5146491
references: Vision Res. 2001;41(25-26):3559-65
references: 11718795
references: J Opt Soc Am A. 1991 Feb;8(2):440-9
references: 2007919
references: Trends Cogn Sci. 2003 Nov;7(11):498-504
references: 14585447
references: Exp Brain Res. 2003 Sep;152(2):156-65
references: 12879179
references: Exp Brain Res. 1994;97(3):471-6
references: 8187858
references: J Exp Psychol Hum Percept Perform. 1998 Jun;24(3):830-46
references: 9627419
references: Perception. 1999;28(11):1311-28
references: 10755142
references: Vision Res. 2000;40(20):2797-811
references: 10960652
references: Hum Factors. 2001 Spring;43(1):111-21
references: 11474756
references: Vision Res. 1998 Mar;38(6):895-909
references: 9624439
references: J Vis. 2004 May 25;4(6):445-58
references: 15330712
references: Neuropsychologia. 2009 Feb;47(3):804-12
references: 19118565
references: J Mot Behav. 2000 Sep;32(3):241-8
references: 10975272
references: J Exp Psychol Hum Percept Perform. 1990 May;16(2):248-67
references: 2142197
references: Neuropsychologia. 1999 Dec;37(13):1437-44
references: 10617263