Recently we have shown that children's ability to perceive motion-defined forms shows an asymmetry in the left and right visual half-fields which disappears in adulthood. The present study is focused on the visual half-field development of colour contrast vision in the same group of subjects. It was found that colour contrast thresholds for the detection of colour-contrast-defined forms decreas...

The authors assessed whether parafoveal perception of emotional content influences saccade programming. In Experiment 1, paired emotional and neutral scenes were presented to parafoveal vision. Participants performed voluntary saccades toward either of the scenes according to an imperative signal (color cue). Saccadic reaction times were faster when the cue pointed toward the emotional picture ...

Pleasant, neutral, or unpleasant pictures appeared for 150 ms in either peripheral or foveal vision, with or without a concurrent foveal load task. Participants indicated whether the visual scene in the picture was or was not pleasant, or was or was not unpleasant. The manipulation of picture location (foveal vs. peripheral) aimed to tap spatial attention, while the perceptual load task was use...

The dual retina of humans and most vertebrates consists of multiple types of cone for colour vision in bright light and one single type of rod, leaving these animals colour-blind at night. Instead of comparing the signals from different spectral types of photoreceptors, they use one highly sensitive receptor, thus improving the signal-to-noise ratio. However, nocturnal moths and geckos can disc...

A follow-up study of colour vision in two patients with gyrate atrophy was performed. Gyrate atrophy was diagnosed in the first patient at the age of 17 years. Her colour vision was first tested at the age of 25 years; at the follow-up examination 7 years later, she correctly interpreted the Standard Pseudoisochromatic Plates part 2, however, with one mistake due to lens opacity. In the Farnswo...

Wavelength discrimination in goldfish was measured behaviourally. Both acute application of ethambutol injected into the eye and chronic application by feeding the animals daily 25 mg ethambutol for 1 month had the same effect on wavelength discrimination in the range of 560-640 nm. This means that: (1) electrophysiological experiments, in which drug application is primarily acute, reflect the ...