Development of the perception of invariants: substance and shape 609 – 619
Eleanor J Gibson, Cynthia J Owsley, Arlene Walker, Jane Megaw-Nyce
Scanning visual images: implications for the representation of space 621 – 628
John R Beech
Flexibility in the choice of distinctive features in visual search with blocked and random designs 629 – 633
Derek W J Corcoran, Alistair Jackson
The effects of verbal meaning and response categorisation on the fragmentation of steadily fixated patterns 635 – 646
Michael T Swanston
Information used in judging impending collision 647 – 658
William Schiff, Mary Lou Detwiler
A new motion illusion 659 – 664
Paul H Schulman
Illusory contours as the solution to a problem 665 – 681
Irvin Rock, Richard Anson
Cerebral asymmetries in random-dot stereopsis: reversal of direction with changes in dot size 683 – 690
Colin B Pitblado
Surfaces with steep variations in depth pose difficulties for orientationally tuned disparity filters 691 – 698
John E W Mayhew, John P Frisby
Individual differences in the visual component of prism adaptation 699 – 706
Lawrence E Melamed, Peter A Beckett, Michael Malay
Adaptation effects on the apparent 'squareness' of square-wave gratings 707 – 710
Jacob Nachmias
Symmetry perception and spatial-frequency channels 711 – 718
Bela Julesz, Jih-Jie Chang
The influence of line reduction and image stabilization on Necker cube reversal: comments upon Ellis and Stark (1978) 719 – 720
David Piggins
Reply to Piggins 721 – 722
Stephen R Ellis, Lawrence Stark
Review 723 – 724
Author index 725 – 728
Subject index 729 – 730
