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The use of viewing posture to control visual processing by lateralised mechanisms

Luca Tommasi^1,* and Richard J. Andrew²

¹ Dipartimento di Psicologia Generale, Università degli Studi di Padova, Via Venezia 8, 35131, Padua, Italy
² Sussex Centre for Neuroscience, School of Biological Sciences, University of Sussex, Brighton, BN1 9QG, UK

View larger version (13K): [in a new window]   Fig. 1. Layout of the experimental arena and the dish conditions: no lid (NOL), square lid (SL), lid with U-shaped indentation (UL) and lid with protruding string (STR).

View larger version (12K): [in a new window]   Fig. 2. Median values for the mean displacement of the track from the direct line of approach for individual chicks. Values are shown for three reference points in the chick's journey to the dish: distant (DIST), mid (MID) and close (CLOSE) (see Materials and methods). Displacements to the chick's left (which would bring the right eye to bear on the dish) are shown as positive. Displacements to the right (which would bring the left eye to bear) are shown as negative. These are largely confined to NOL chicks. Almost all conditions departed significantly at all three points from an even distribution of right and left displacement: P values for DIST, MID and CLOSE, respectively, are: NOL, P=0.004, P=0.013, P=0.024; SL, P=0.018, P=0.044, P=0.0001; UL, P=0.001, P=0.002, P=0.040; STR, P=0.016, P=0.016, P=0.066. See Fig. 1 legend for description of dish conditions and Materials and methods for details of chick numbers and trials.

View larger version (26K): [in a new window]   Fig. 3. Frequencies of occurrence of particular head positions for the four dish conditions NOL, SL, UL and STR for the CLOSE reference point (measurement position nearest to the dish), combined for all individuals. The data are blocked into 5° bins (head angles) (see text for details). Analyses based on single scores for each individual are given in the text. See Fig. 1 legend for description of dish conditions. Bin, binocular (0°).

View larger version (26K): [in a new window]   Fig. 4. Frequencies of occurrence of particular head positions for the four dish conditions NOL, SL, UL and STR for the MID reference point (middle measurement point). All other conventions as in Fig. 3. Bin, binocular (0°).

View larger version (26K): [in a new window]   Fig. 5. Frequencies of occurrence of particular head positions for the four dish conditions NOL, SL, UL and STR for the DISTANT point (measurement point further from the dish). All other conventions as in Fig. 3. Bin, binocular (0°).

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