Interaction of visual and non-visual cues during migratory orientation by the Bobolink (Dolichonyx oryzivorus)

1987 ◽  
Vol 128 (3) ◽  
pp. 317-324 ◽  
Author(s):  
Robert C. Beason
Keyword(s):  
Visual Cues ◽  
Dolichonyx Oryzivorus ◽  
Migratory Orientation

scholarly journals New cue-conflict experiments suggest a leading role of visual cues in the migratory orientation of Pied Flycatchers Ficedula hypoleuca

2014 ◽  
Vol 156 (1) ◽  
pp. 113-121 ◽  
Author(s):  
Dimitri Giunchi ◽  
Lorenzo Vanni ◽  
N. Emilio Baldaccini ◽  
Fernando Spina ◽  
Francesca Biondi
Keyword(s):  
Visual Cues ◽  
Ficedula Hypoleuca ◽  
Migratory Orientation ◽  
Leading Role ◽  
Cue Conflict

scholarly journals MELATONIN IS CRUCIAL FOR THE MIGRATORY ORIENTATION OF PIED FLYCATCHERS (FICEDULA HYPOLEUCA PALLAS)

1994 ◽  
Vol 194 (1) ◽  
pp. 255-262 ◽  
Author(s):  
T Schneider ◽  
HP Thalau ◽  
P Semm ◽  
W Wiltschko
Keyword(s):  
Geomagnetic Field ◽  
Visual Cues ◽  
Ficedula Hypoleuca ◽  
Autumn Migration ◽  
Migratory Direction ◽  
Migratory Orientation ◽  
Directional Preference ◽  
Species Specific

After pinealectomy, young pied flycatchers tested in the geomagnetic field have been found to be disoriented. In order to examine the possible role of the pineal hormone melatonin, handraised flycatchers were pinealectomized (PX) at the age of 8 weeks. From the day of operation onward, the PXMEL group received 100 µg of melatonin every evening 1 h before darkness, the PXSOL group was injected with the solvent only, and the PX group was untreated. Unoperated birds served as controls. During the following autumn migration, the birds were tested for directional preference in the local geomagnetic field, in the absence of visual cues. The controls were oriented in the species-specific southwesterly direction; pinealectomized birds without additional melatonin (PXSOL, PX) did not show directional preferences. The PXMEL birds that had received daily injections of melatonin also showed significant southwesterly tendencies; their orientation did not differ from that of the controls. This indicates that melatonin is involved in migratory orientation, either in the processes of expressing the genetically encoded information on the migratory course as a direction with respect to the geomagnetic field or in the time programme controlling the specific migratory direction at a given time.

Does the avian ophthalmic nerve carry magnetic navigational information?

1996 ◽  
Vol 199 (5) ◽  
pp. 1241-1244 ◽  
Author(s):  
R Beason ◽  
P Semm
Keyword(s):  
Magnetic Field ◽  
Nervous System ◽  
Trigeminal Nerve ◽  
Magnetic Pulse ◽  
Earth’S Magnetic Field ◽  
Directional Information ◽  
Dolichonyx Oryzivorus ◽  
Migratory Orientation ◽  
Earth's Magnetic Field ◽  
Ophthalmic Branch

The bobolink (Dolichonyx oryzivorus) uses the earth's magnetic field as one source of directional information for its migratory orientation. However, the location and structure of the magnetoreceptors that transduce the magnetic information to the nervous system are unknown. Because treatment with a strong magnetic pulse results in a change in the direction of orientation, one of the receptors is thought to involve a magnetizable material such as magnetite. The effects of the magnetizing treatment can be abolished (i.e. the bird returns to its original orientation) by blocking the ophthalmic branch of the trigeminal nerve, but the ability of the bird to select and maintain a direction is not affected. These results are consistent with the hypothesis that a magnetizable material such as magnetite is part of the magnetoreceptors that are associated with the ophthalmic nerve.

Supporting the Use of Rudimentary Vocalizations

2014 ◽  
Vol 23 (3) ◽  
pp. 132-139 ◽  
Author(s):  
Lauren Zubow ◽  
Richard Hurtig
Keyword(s):  
Rett Syndrome ◽  
Visual Cues ◽  
Acoustic Analysis ◽  
Eye Gaze ◽  
Research Question ◽  
Primary Research ◽  
Multiple Modalities ◽  
Face To Face ◽  
Perceptual Judgments ◽  
The Face

Children with Rett Syndrome (RS) are reported to use multiple modalities to communicate although their intentionality is often questioned (Bartolotta, Zipp, Simpkins, & Glazewski, 2011; Hetzroni & Rubin, 2006; Sigafoos et al., 2000; Sigafoos, Woodyatt, Tuckeer, Roberts-Pennell, & Pittendreigh, 2000). This paper will present results of a study analyzing the unconventional vocalizations of a child with RS. The primary research question addresses the ability of familiar and unfamiliar listeners to interpret unconventional vocalizations as “yes” or “no” responses. This paper will also address the acoustic analysis and perceptual judgments of these vocalizations. Pre-recorded isolated vocalizations of “yes” and “no” were presented to 5 listeners (mother, father, 1 unfamiliar, and 2 familiar clinicians) and the listeners were asked to rate the vocalizations as either “yes” or “no.” The ratings were compared to the original identification made by the child's mother during the face-to-face interaction from which the samples were drawn. Findings of this study suggest, in this case, the child's vocalizations were intentional and could be interpreted by familiar and unfamiliar listeners as either “yes” or “no” without contextual or visual cues. The results suggest that communication partners should be trained to attend to eye-gaze and vocalizations to ensure the child's intended choice is accurately understood.

Visual Cues Effects on Temperature Perception

2014 ◽  
Author(s):  
Carrie Anne Balcer ◽  
Andrew Shirtz ◽  
Taylor Rolison ◽  
Mounia Ziat
Keyword(s):  
Visual Cues ◽  
Temperature Perception
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