Ocelli
نویسنده
چکیده
What’s your next historical work on? I’m thinking about the power of metaphor in science and the way it frames and limits how we think about the natural world. I’ve already written about 17th and 18th century approaches to heredity, and the history of the genetics of behaviour in the 1950s. In both cases, scientific progress was limited by the metaphors people used. The early modern view that animals were machines could not cope with hereditary phenomena that combined both blending inheritance and particulate inheritance, and so people simply ignored the problem. 250 years later, the ethologists of the 1950s and 1960s seem to have not picked up on the analogies with cybernetics — feedback loops and so on — that were being used with such effect by the molecular biologists. I want to expand this to a more general analysis of the role of metaphor in science.
منابع مشابه
Understanding the Structural and Developmental Aspect of Simple Eye of Drosophila: The Ocelli
Among various photoreceptors present in arthropods Drosophila eye undergoes certain modification to provide high resolution and sensitivity to the animal. Along with the compound eye Drosophila possess three ocelli for its vision, navigation and locomotion purpose. These ocelli are arranged in a triangular manner in between the compound eye. During third instar larvae, from the eye antenna imag...
متن کاملThe evolution of peafowl and other taxa with ocelli (eyespots): a phylogenomic approach.
The most striking feature of peafowl (Pavo) is the males' elaborate train, which exhibits ocelli (ornamental eyespots) that are under sexual selection. Two additional genera within the Phasianidae (Polyplectron and Argusianus) exhibit ocelli, but the appearance and location of these ornamental eyespots exhibit substantial variation among these genera, raising the question of whether ocelli are ...
متن کاملForm vision in the insect dorsal ocelli: An anatomical and optical analysis of the Locust Ocelli
The dorsal ocelli are commonly considered to be incapable of form vision, primarily due to underfocused dioptrics. We investigate the extent to which this is true of the ocelli of the locust Locusta migratoria. Locust ocelli contain thick lenses with a pronounced concavity on the inner surface, and a deep clear zone separating retina and lens. In agreement with previous research, locust ocellar...
متن کاملThe role of the ocelli in the phototactic behaviour of the haematophagous bug Triatoma infestans.
In addition to compound eyes, most adult insects posses two or three simple eyes, the ocelli. The function of these photoreceptors remains elusive in most cases. Triatomine bugs posses two well-developed ocelli, located in a latero-dorsal position, behind the compound eyes. We tested the role of the ocelli in the phototactic behaviour of Triatoma infestans, by measuring the time spent by adult ...
متن کاملHomology of the Lateral Eyes of Scorpiones: A Six-Ocellus Model
Scorpions possess two types of visual organs, the median and lateral eyes. Both eyes consist of simple ocelli with biconvex lenses that differ in structure and function. There is little variation in the number of median ocelli across the order. Except for a few troglomorphic species in which the median ocelli are absent, all scorpions possess a single pair. In contrast, the number of pairs of l...
متن کاملOcelli contribute to the encoding of celestial compass information in the Australian desert ant Melophorus bagoti.
Many animal species, including some social hymenoptera, use the visual system for navigation. Although the insect compound eyes have been well studied, less is known about the second visual system in some insects, the ocelli. Here we demonstrate navigational functions of the ocelli in the visually guided Australian desert ant Melophorus bagoti. These ants are known to rely on both visual landma...
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ورودعنوان ژورنال:
- Current Biology
دوره 19 شماره
صفحات -
تاریخ انتشار 2009