PhylogeneticsIn biology, phylogenetics (ˌfaɪloʊdʒəˈnɛtɪks,_-lə-) is the study of the evolutionary history and relationships among or within groups of organisms. These relationships are determined by phylogenetic inference methods that focus on observed heritable traits, such as DNA sequences, protein amino acid sequences, or morphology. The result of such an analysis is a phylogenetic tree—a diagram containing a hypothesis of relationships that reflects the evolutionary history of a group of organisms.
Phylogenetic treeA phylogenetic tree (also phylogeny or evolutionary tree) is a branching diagram or a tree showing the evolutionary relationships among various biological species or other entities based upon similarities and differences in their physical or genetic characteristics. All life on Earth is part of a single phylogenetic tree, indicating common ancestry. In a rooted phylogenetic tree, each node with descendants represents the inferred most recent common ancestor of those descendants, and the edge lengths in some trees may be interpreted as time estimates.
One (pronoun)One is an English language, gender-neutral, indefinite pronoun that means, roughly, "a person". For purposes of verb agreement it is a third-person singular pronoun, though it sometimes appears with first- or second-person reference. It is sometimes called an impersonal pronoun. It is more or less equivalent to the Scots "a body", the French pronoun on, the German/Scandinavian man, and the Spanish uno. It can take the possessive form one's and the reflexive form oneself, or it can adopt those forms from the generic he with his and himself.
Functional magnetic resonance imagingFunctional magnetic resonance imaging or functional MRI (fMRI) measures brain activity by detecting changes associated with blood flow. This technique relies on the fact that cerebral blood flow and neuronal activation are coupled. When an area of the brain is in use, blood flow to that region also increases. The primary form of fMRI uses the blood-oxygen-level dependent (BOLD) contrast, discovered by Seiji Ogawa in 1990.
Broca's areaBroca's area, or the Broca area (ˈbroʊkə, also UKˈbrɒkə, USˈbroʊkɑː), is a region in the frontal lobe of the dominant hemisphere, usually the left, of the brain with functions linked to speech production. Language processing has been linked to Broca's area since Pierre Paul Broca reported impairments in two patients. They had lost the ability to speak after injury to the posterior inferior frontal gyrus (pars triangularis) (BA45) of the brain.
It (pronoun)In Modern English, it is a singular, neuter, third-person pronoun. In Modern English, it has only three shapes representing five word forms: it: the nominative (subjective) and accusative (objective) forms. (The accusative case is also called the "oblique".) its: the dependent and independent genitive (possessive) forms itself: the reflexive form Historically, though, the morphology is more complex. Old English had a single third-person pronoun – from the Proto-Germanic demonstrative base *khi-, from PIE *ko- "this" – which had a plural and three genders in the singular.
Speech productionSpeech production is the process by which thoughts are translated into speech. This includes the selection of words, the organization of relevant grammatical forms, and then the articulation of the resulting sounds by the motor system using the vocal apparatus. Speech production can be spontaneous such as when a person creates the words of a conversation, reactive such as when they name a picture or read aloud a written word, or imitative, such as in speech repetition.
PronounIn linguistics and grammar, a pronoun (abbreviated ) is a word or a group of words that one may substitute for a noun or noun phrase. Pronouns have traditionally been regarded as one of the parts of speech, but some modern theorists would not consider them to form a single class, in view of the variety of functions they perform cross-linguistically. An example of a pronoun is "you", which can be either singular or plural. Subtypes include personal and possessive pronouns, reflexive and reciprocal pronouns, demonstrative pronouns, relative and interrogative pronouns, and indefinite pronouns.
Lobes of the brainThe lobes of the brain are the major identifiable zones of the cerebral cortex, and they comprise the surface of each hemisphere of the cerebrum. The two hemispheres are roughly symmetrical in structure, and are connected by the corpus callosum. They traditionally have been divided into four lobes, but are today considered as having six lobes each. The lobes are large areas that are anatomically distinguishable, and are also functionally distinct to some degree.
Gender neutrality in languages with gendered third-person pronounsA third-person pronoun is a pronoun that refers to an entity other than the speaker or listener. Some languages with gender-specific pronouns have them as part of a grammatical gender system, a system of agreement where most or all nouns have a value for this grammatical category. A few languages with gender-specific pronouns, such as English, Afrikaans, Defaka, Khmu, Malayalam, Tamil, and Yazgulyam, lack grammatical gender; in such languages, gender usually adheres to "natural gender", which is often based on biological sex.
