Coloured Vision

The Recognition of Flashing Coloured Lights by Persons with Normal and Defective Colour Vision.

sudden onset, oed&ma of retinal tissues, equally sudden cessation on removal of the cause and complete restoration of vision. (2) Whenever chronic nephritis complicates pregnancy, the visual disturbances are due to renal retinitis. (3) This retinitis is associated with high blood-pressure which, together with the signs of retinitis, have a tendency to persist after delivery. (4) This form of re...

Multi-coloured stereograms unveil two binocular colour mechanisms in human vision

Two different colours, one presented to one eye and the other presented to the other eye, often create the impression of a third colour. This percept is known as binocular colour mixture. Here we use coloured stereograms to study binocular colour appearance. Vivid pastel colours are induced in monocular, achromatic patches, if these are placed in stereograms whose left and right images differ i...

Coloured Spectacles

Properly Coloured Hamiltonian Paths in Edge-coloured Complete Graphs

We consider edge-coloured complete graphs. A path or cycle Q is called properly coloured (PC) if any two adjacent edges of Q differ in colour. Our note is inspired by the following conjecture by B. Bollobás and P. Erdős (1976) : if G is an edge-coloured complete graph on n vertices in which the maximum monochromatic degree of every vertex is less than bn/2c, then G contains a PC Hamiltonian cyc...

Large 2-Coloured Matchings in 3-Coloured Complete Hypergraphs

We prove the generalized Ramsey-type result on large 2-coloured matchings in a 3-coloured complete 3-uniform hypergraph, supporting a conjecture by A. Gyárfás.