Part Four: Semantics and Pragmatics

Semantics
Lexical semantics is concerned with the meanings of words and the meaning of relationships among words, while phrasal semantics is concerned with the meaning of syntactic units larger than the word. Pragmatics is the study of how context affects meaning, such as how sentences are interpreted in certain situations.

Semantic properties are the components of meanings of words. For example, the semantic property "human" can be found in many words such as parent, doctor, baby, professor, widow, and aunt. Other semantic properties include animate objects, male, female, countable items and non-countable items.

The -nyms
Homonyms: different words that are pronounced the same, but may or may not be spelled the same (to, two, and too)

Polysemous: word that has multiple meanings that are related conceptually or historically (bear can mean to tolerate or to carry or to support)

Homograph: different words that are spelled identically and possibly pronounced the same; if they are pronounced the same, they are also homonyms (pen can mean writing utensil or cage)

Heteronym: homographs that are pronounced differently (dove the bird and dove the past tense of dive)

Synonym: words that mean the same but sound different (couch and sofa)

Antonym: words that are opposite in meaning
Complementary pairs: alive and dead
Gradable pairs: big and small (no absolute scale)

Hyponym: set of related words (red, white, yellow, blue are all hyponyms of "color")

Metonym: word used in place of another to convey the same meaning (jock used for athlete, Washington used for American government, crown used for monarcy)

Retronym: expressions that are no longer redundant (silent movie used to be redundant because a long time ago, all movies were silent, but this is no longer true or redundant)

Thematic Roles
Thematic roles are the semantic relationships between the verbs and noun phrases of sentences. The following chart shows the thematic roles in relationship to verbs of sentences:

Thematic Role	Description	Example
Agent	the one who performs an action	Maria ran
Theme	the person or thing that undergoes an action	Mary called John
Location	the place where an action takes place	It rains in Spain
Goal	the place to which an action is directed	Put the cat on the porch
Source	the place from which an action originates	He flew from Chicago to LA
Instrument	the means by which an action is performed	He cuts his hair with scissors
Experiencer	one who perceives something	She heard Bob play the piano
Causative	a natural force that causes a change	The wind destroyed the house
Possessor	one who has something	The tail of the cat got caught
Recipient	one who receives something	I gave it to the girl

Sentential Meaning
The meaning of sentences is built from the meaning of noun phrases and verbs. Sentences contain truth conditions if the circumstances in the sentence are true. Paraphrases are two sentences with the same truth conditions, despite subtle differences in structure and emphasis. The ball was kicked by the boy is a paraphrase of the sentence the boy kicked the ball, but they have the same truth conditions - that a boy kicked a ball. Sometimes the truth of one sentence entails or implies the truth of another sentence. This is called entailment and the opposite of this is called contradiction, where one sentence implies the falseness of another. He was assassinated entails that he is dead. He was assassinated contradicts with the statement he is alive.

Pragmatics
Pragmatics is the interpretation of linguistic meaning in context. Linguistic context is discourse that precedes a sentence to be interpreted and situational context is knowledge about the world. In the following sentences, the kids have eaten already and surprisingly, they are hungry, the linguistic context helps to interpret the second sentence depending on what the first sentence says. The situational context helps to interpret the second sentence because it is common knowledge that humans are not usually hungry after eating.

Maxims of Conversation
Grice's maxims for conversation are conventions of speech such as the maxim of quantity that states a speaker should be as informative as is required and neither more nor less. The maxim of relevance essentially states a speaker should stay on the topic, and the maxim of manner states the speaker should be brief and orderly, and avoid ambiguity. The fourth maxim, the maxim of quality, states that a speaker should not lie or make any unsupported claims.

Performative Sentences
In these types of sentences, the speaker is the subject who, by uttering the sentence, is accomplishing some additional action, such as daring, resigning, or nominating. These sentences are all affirmative, declarative and in the present tense. An informal test to see whether a sentence is performative or not is to insert the words I hereby before the verb. I hereby challenge you to a match or I hereby fine you $500 are both performative, but I hereby know that girl is not. Other performative verbs are bet, promise, pronounce, bequeath, swear, testify, and dismiss.

Presuppositions
These are implicit assumptions required to make a sentence meaningful. Sentences that contain presuppositions are not allowed in court because accepting the validity of the statement mean accepting the presuppositions as well. Have you stopped stealing cars? is not admissible in court because no matter how the defendant answers, the presupposition that he steals cars already will be acknowledged. Have you stopped smoking? implies that you smoke already, and Would you like another piece? implies that you've already had one piece.

Deixis
Deixis is reference to a person, object, or event which relies on the situational context. First and second person pronouns such as my, mine, you, your, yours, we, ours and us are always deictic because their reference is entirely dependent on context. Demonstrative articles like this, that, these and those and expressions of time and place are always deictic as well. In order to understand what specific times or places such expressions refer to, we also need to know when or where the utterance was said. If someone says "I'm over here!" you would need to know who "I" referred to, as well as where "here" is. Deixis marks one of the boundaries of semantics and pragmatics.

Part Five: Neurolinguistics

The human brain consists of 10 billion nerve cells (neurons) and billions of fibers that connect them. These neurons or gray matter form the cortex, the surface of the brain, and the connecting fibers or white matter form the interior of the brain. The brain is divided into two hemispheres, the left and right cerebral hemispheres. These hemispheres are connected by the corpus callosum. In general, the left hemisphere of the brain controls the right side of the body and vice versa.

The auditory cortex receives and interprets auditory stimuli, while the visual cortex receives and interprets visual stimuli. The angular gyrus converts the auditory stimuli to visual stimuli and vice versa. The motor cortex signals the muscles to move when we want to talk and is directed by Broca's area. The nerve fiber connecting Wernicke's and Broca's area is called the arcuate fasciculus.

Lateralization refers to any cognitive functions that are localized to one side of the brain or the other. Language is said to be lateralized and processed in the left hemisphere of the brain. Paul Broca first related language to the left side of the brain when he noted that damage to the front part of the left hemisphere (now called Broca's area) resulted in a loss of speech, while damage to the right side did not. He determined this through autopsies of patients who had acquired language deficits following brain injuries. A language disorder that follows a brain lesion is called aphasia, and patients with damage to Broca's area have slow and labored speech, loss of function words, and poor word order, yet good comprehension.

Carl Wernicke also used studies of autopsies to describe another type of aphasia that resulted from lesions in the back portion of the left hemisphere (now called Wernicke's area.) Unlike Broca's patients, Wernicke's spoke fluently and with good pronunciation, but with many lexical errors and a difficulty in comprehension. Broca's and Wernicke's area are the two main regions of the cortex of the brain related to language processing.

Aphasics can suffer from anomia, jargon aphasia, and acquired dyslexia. Anomia is commonly referred to as "tip of the tongue" phenomenon and many aphasics experience word finding difficulty on a regular basis. Jargon aphasia results in the substitution of one word or sound for another. Some aphasics may substitute similar words for each other, such as table for chair, or they may substitute completely unrelated words, such as chair for engine. Others may pronounce table as sable, substituting an s sound for a t sound. Aphasics who became dyslexic after brain damage are called acquired dyslexics. When reading aloud words printed on cards, the patients produced the following substitutions:

Stimuli	Response One	Response Two
Act	Play	Play
South	East	West
Heal	Pain	Medicine

The substitution of phonologically similar words, such as pool and tool, also provides evidence that a human's mental lexicon is organized by both phonology and semantics.

Broca's aphasics and some acquired dyslexics are unable to read function words, and when presented with them on the cards, the patients say no, as shown in the following example:

Stimuli One	Response	Stimuli Two	Response
Witch	Witch	Which	no!
Hour	Time	Our	no!
Wood	Wood	Would	no!

The patient's errors suggest our mental dictionary is further organized into parts consisting of major content words (first stimuli) and grammatical words (second stimuli.)

In addition, split-brain patients (those who have had their corpus callosum severed) provide evidence for language lateralization. If an object is placed in the left hand of split-brain patient whose vision is cut off, the person cannot name the object, but will know how to use it. The information is sent to the right side of the brain, but cannot be relayed to the left side for linguistic naming. However, if the object is placed in the person's right hand, the person can immediately name it because the information is sent directly to the left hemisphere.

Dichotic listening is another experimental technique, using auditory signals. Subjects hear a different sound in each ear, such as boy in the left ear and girl in the right ear or water rushing in the left ear and a horn honking in the right ear. When asked to state what they heard in each ear, subjects are more frequently correct in reporting linguistic stimuli in the right ear (girl) and nonverbal stimuli in the left ear (water rushing.) This is because the left side of the brain is specialized for language and a word heard in the right ear will transfer directly to the left side of the body because of the contralateralization of the brain. Furthermore, the right side of the brain is specialized for nonverbal stimuli, such as music and environmental sounds, and a noise heard in the left ear will transfer directly to the right side of the brain.