... Harris's hawks tested, individuals with higher estimated visual acuity made more horizontal head movements before making a decision. This may reflect an increase in the use of monocular vision. Harris's hawks have two foveas (one central and one temporal), while black kites have only one central fovea...

.... Behavioural and anatomical results suggest that the mobile Schnauzenorgan and the nasal region serve special functions in electroreception, and can therefore be considered as electric foveae. We investigated passive pre-receptor mechanisms that shape and enhance the signal carrier. These mechanisms allow...

...-mail: angel@iibce.edu.uy ) 10 12 2002 © The Company of Biologists Limited 2003 2003 contrast discrimination contrast adaptation electric fish Gymnotus carapo fovea short term memory sensory representation References Aguilera, P. A. and Caputi, A. A. ( 2003...

... efficient stimulus for electroreceptors. It can be concluded that the passive properties of the fish tissue represent a pre-receptor device that enhances exafferent and reafferent electrical signals at the fovea–parafoveal region. References Bastian , J. ( 1986 ). Electrolocation: behavior...