... ). The effect of target orientation on the visual acuity and the spatial frequency response of the locust eye . J. Insect Physiol.   45 , 191 - 200 . 10.1016/S0022-1910(98)00117-6 Chakravarthi , A. , Baird , E. , Dacke , M. and Kelber , A. ( 2016 ). Spatial vision in Bombus...

... of objects. Optokinetic eye movements Contrast sensitivity Acuity Spatial resolving power Sharks are often described as having ‘poor’ vision. This conclusion is based on their lack of colour vision ( Hart et al., 2011 ; Schluessel et al., 2014 ) and low spatial resolving power ( Hueter...

... optical structures and photobehaviors found in this phylum. * Author for correspondence (e-mail: [email protected] ) 15 9 2004 © The Company of Biologists Limited 2004 2004 vision acuity echinoderm echinoid visual Photoreception is generally divided into two categories...

...Todd Macuda; Robert J. Gegear; Terence M. Laverty; Brian Timney ABSTRACT The present study used previously developed techniques to measure resolution acuity in bumblebees ( Bombus impatiens ). Bees were required to discriminate between horizontal and vertical gratings in a Y-maze apparatus...

...W. R. A. Muntz; J. Gwyther ABSTRACT A recent study has shown that the minimum separable angle of visual acuity of Octopus pallidus and O. australis lies between 4·4′ and 9·7′ when vertical and horizontal gratings are used as test objects ( Muntz & Gwyther, 1988 ). In view of other observations...

... species the minimum separable visual acuity is less than 9·7′. The behaviour of the two species is very similar to that of 0. vulgaris , except that they accept less food per day, so fewer trials could be given. 27 7 1987 © 1988 by Company of Biologists 1988 octopus vision acuity...