Extrapolation or attention shift?
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Biomedical subjects
M V Baldo
Publications and source records attributed to M V Baldo.
Accessory optic-pretectal interactions in the pigeon.
This electrophysiological study analyzes the influence of the nucleus of the basal optic root (nBOR) of the avian accessory optic system on units within the lentiform nucleus (LM), which is the avian equivalent of the pretectal nucleus of the optic tract. A prominent depression of the spontaneous firing rate of neurons within the LM occurred following electrical stimulation of the ipsilateral nBOR. A close correlation was also found between the directional selectivity of LM units and the apparent displacements generated by rotations of the head around the horizontal semicircular canal axis. This is consistent with a possible role of the LM in the coordinate transformation from visual inputs to a vestibular reference system.
Animals↗
The spatial arrangement of the semicircular canals of the pigeon.
The spatial orientation of the semicircular canals (SCC) was measured in the pigeon by fitting the best plane over 10 to 15 stereotaxically determined points to each canal. The vectors defining each canal plane are presented in the standard stereotaxic position and for free moving behavior, and the coplanarity or orthogonality of pairs of semicircular canals are discussed.
Animals↗
The relation between head and apparent visual field motion in the pigeon (Columba livia).
In order to study the relationship between the apparent motion of the visual field as a function of head motion, we have developed an equation that describes the apparent displacement of objects in the visual field produced by a general movement of the head consisting of a rotation plus a translation. We then used this equation to simulate the apparent motion of the visual field of a pigeon produced by rotation of the head about axes parallel to those of its anterior semicircular canals.
Animals↗