Language and communication Flashcards
Define communication
Relation between signal and response
(Language is a subtype)
What are adaptionist and informational views of communication?
Adaptionist = communication has adaptive benefit
Informational = biological signals carry information to reduce uncertainty
Define signal and response
Signal = something that has evolved to alter behaviour of others
Response = an act which has evolved to be affected by a signal
Define language
Sophisticated symbol-based communication system governed by hierarchical rules, requiring many sophisticated cognitive processes
What are the three rules of language?
1) Open and generative = always evolving new words, signals and meanings
(animals have closed system)
2) Referential and conveys specific meanings = speech, gestures and writing refer to things in the world, symbols can be highly specific or general
3) Hierarchical structure governed by syntactic rules
What are the five components of the universal structure of language?
Syntax - rules and principles that govern the structure of a language (grammar)
Semantics - the meaning of linguistic units like words, signs and gestures (relationship between symbol and what it represents)
Phonology - organisation of speech sounds - phonemes (smallest unit) meaningless sounds which combine to form meaningful units
Pragmatics - context gives language meaning (e.g. homonyms)
Morphology - structure of words and rules of how they are formed - morphemes are smallest meaningful units of language
What does ‘language is modality independent’ mean?
It is not dependent on a single modality (e.g. speech or visual cues)
What makes sign language a language?
It has the same linguistic features as other languages and develops at the same pace in childhood
What is homology
Estimates of shared traits or sequences
What are the three language evolution routes?
Vocal route
Gestural route - more components than primate vocalisations
Multi-modal route (both) - gesture changes perception of speech
What is communicative flexibility?
Learning to produce new sounds and vocally imitating
Animals are excellent vocal learners (whales, birds, bats) and vocal mimicry is excellent in male superb lyrebird (imitates 24 other species for reproductive advantage)
Primates - limited vocal learning, instead use gestures for more complex communication
What is referential communication
Vocalisations refer to objects - semantic communication (not emotion-bound)
e.g. Vervet monkey alarm calls - distinct for leopards, eagles, snakes - trigger different behavioural responses
Playback experiments - playing animal sounds and observing behavioural responses
What are call sequences?
Basic form of syntax - order changes meaning
e.g. Putty-nosed monkey:
Hack - eagles
Pyow - leopards
Pyow-hack - travel
e.g. Bonobos - different calls based on quality of food - one for high, one for low, and a combination for medium (confirmed by playback experiments)
What are audience effects and intentionality?
Intentionally adapt signals according to who they are talking to - not indiscriminate, sensitive to the audience
e.g. Chimpanzees more likely to produce food calls when friend present than non-friend
e.g. Chimpanzees inform each other about danger - more likely to produce alarm calls if they know one chimp cannot see snake
What are ape gestures?(General definition)
Discrete, mechanically ineffective body movement used intentionally to affect knowledge and change behaviour of receiver
Same properties that language has
Who were the apes taught to use spoken language?
Gua - chimpanzee (1930s)
- Enculturated - raised as if human
- Never produced intelligible words
Viki - chimpanzee (1950s)
- Enculturated and given reinforcement training
- After 7 years - only produced 4 words
(Apes not good vocal learners like humans, better at gestures)
Who were the apes taught to use ASL?
Washoe - chimpanzee
- Could produce 150-250 ASL signs and understood 100s
- Used signs with other chimpanzees
- Imitative - little creativity (only example was signing water and bird for swan)
- Dissimilar to children learning ASL
Nim Chimpsky - chimpanzee
- Produced around 350 ASL signs
- Not like language - mainly imitative, imperative and lacked syntax
Slower learner than typical developing child
- Me eat orange
Who was the ape taught to use a lexigram board?
Kanzi - the world’s cleverest bonobo
- Language trained using lexigram board with 348 symbols
- Understood at least 3000 spoken English words
Still limited production and mainly just for imperative demands
What ethical issues were associated with research on apes?
- Kanzi was massively overweight as his trainer fed him human unhealthy foods
- Wrong to raise wild animals as humans
- Not enough scientific justification - exploiting animals for human curiosity
What are limitations of early ape language studies?
- Apes have impressive comprehension, but limited production
- Unlike children - imperative, rewards based, slow acquisition
- Limited combinatorial skills (syntax)
- Enculturation is not natural - extensive human experience means low ecological validity
- Naturalistic studies instead tell us more about the development of language
What is the role and location of Broca’s area?
Role = language production (speech)
Location = inferior frontal gyrus, frontal lobe, left hemisphere
Is Broca’s area uniquely human?
No:
Cantalupo and Hopkins conducted MRI scans of ape brains which showed Brodmann’s area 44 in their left hemisphere (a homolog of Broca’s area)
What is the role and location of Wernicke’s area?
Role = language comprehension
Location = temporoparietal junction of posterior superior temporal lobe, left hemisphere
Evidence for ape Wernicke’s area and similarities between Wernicke’s and Broca’s?
- Spocter found chimpanzees had left hemisphere asymmetries in area TPT (temporo-parietal association cortex)
- Neuron density in TPT correlated with that in Brodmann’s 45, part of Broca’s area
What is the role of gestures in language evolution?(Brain)
Critical to language evolution - handedness shows strong brain asymmetries in areas supporting manual action (tool use and communication)
What research supports the multi-modal nature of language in apes?
Tagliatela scanned chimp brains while they had to ask for food
1/2 just gestured, 1/2 made noise and gestured
Multi-modal chimps had more activity in Broca’s area
What happened during the Primate brain evolution?
Huge brain size expansion as apes developed
Therefore, humans (and great apes) have large brains in comparison to body, and large cortical areas
Brain takes lots of energy
What is the social brain hypothesis? (Dunbar, 1998)
Social complexity drives primate cognition - brain size facilitates social relationships
What is the Cultural intelligence hypothesis? (Shaik et al. 2011)
Co-evolution of cognition and culture (highly cultural correlates to highly smart)
What is the Foraging brain hypothesis?
Diet not sociality better predicts brain size expansion in primates
Foraging fruit and extractive foraging - using tools and foraging requires high intelligence
What has happened to cerebral blood flow rate as genus Homo has evolved?
It has increased
What has happened to brain size between H. erectus (1.5-2 MYA) and H. sapiens (200,000 years ago)?
It has doubled
What was happening while human brain size and cerebral blood flow increased?
A period of dramatic climate change
What evidence points to the likely starting point of language?
First evidence of symbolic artefacts representing the world - date back only 100,000 years
Language is symbolic - associated with symbolic thought (referential)
What did Rizolatti (1992) find out about mirror neurons in rhesus macaques?
Monkey see, monkey do:
- Same brain region activated when monkey goes to eat and when monkey saw others eat - brain area representing observed action in someone else, finding the observed intention in the action
- Mirror neurons are implicated in language, imitation, action, learning, action understanding and empathy
What is the Gestural theory of language evolution? (Corballis, 2010) (MNs)
‘Hand to mouth’ - language evolved from gestures
- MNs are generally active during speech perception
- MNs contribute to complex control systems, but do so in low-level ways - play a role but are not dominant and do not act alone
What is brain laterality?
Asymmetries in brain form and function between the hemispheres
(Not one hemisphere being exclusive to a function, just being dominant)
What is the role of the left hemisphere in language?
Analysis of sequences:
- Comprehension and production of speech and language
- Logic, reasoning and analysis
What is the role of the right hemisphere in language?
Visual-spatial skills
- Processing space and shapes
- Organising a narrative (elements of what we want to say)
- Understanding speech rhythm and intonation (prosody)
- Recognising and expressing emotions in speech
- Music
What did split brain research show about hemispheric lateralisation of language?
Severed corpus callosum (epilepsy treatment)
Left hemisphere used only - could read and verbally communicate
Right hemisphere - could identify visuo-spatial information but not linguistically communicate (could draw with left hand then identify image using whole brain)
Only processing involving left hemisphere could be verbally described
What did Broca find out about Tan?
Found damage to left inferior frontal cortex during a post-mortem of the language-impaired patient (Brodmann 44 and 45)
What is Broca’s aphasia?
Typically due to strokes - can comprehend language, but language production is impaired - speech is non-fluent, laboured and hesitant, can lose ability to name persons or objects
What did Wernicke find?
Found patients with damage to left posterior temporal cortex struggled with language comprehension (Brodmann 22 and others)
What is Wernicke’s aphasia?
Problems in language comprehension - speech is often fluent but meaningless, patients unaware of their deficit, patients cannot repeat words or sentences and cannot recognise speech sounds
Usually not due to partial paralysis (stroke)
What is the Nativist perspective of language learning? (Chomsky)
- Humans are biologically programmed to acquire language
- Born with a ‘language acquisition device’
- Humans are born prepared for a Universal Grammar - an abstract set of rules common to all languages (all languages have similar properties)
- Infants are born with some ‘core knowledge’ about the world - babies can understand complex things at birth - Elizabeth Spelke
What support is there for the Nativist perspective of language learning (Chomsky)
- Children master language quickly and easily, despite little explicit training and difficulty of the task
- Children can invent new languages without any exposure (new sign languages)
- Newborns are sensitive to language - they prefer speech and discriminate the phonemes of all the world’s languages
- Most children pass through a predictable sequence of language learning stages
- Sensitive periods - children have a critical period in their life when language readily develops, after which acquisition is more difficult. Linguistic competence is predicted by age of acquisition, not length of exposure. Peak linguistic proficiency in youngest learners (Alissa Newport). Before age 6, language learning can be equivalent to that of native speakers, after which it starts to decline
What limitations are there for the Nativist perspective of language learning? (Chomsky)
- No ‘Universal Grammar’
- Neuroscience shows distributed nature of language and plasticity of language processing (changeable)
- Nativism often focusses heavily on word learning and syntax, neglecting socio-cognitive aspects
- Overlooks how gene expression is influenced by environment
- Alternative explanations - learn about speech or manual gestures in the womb
What is the Empiricist perspective of language learning? (Skinner, Bruner)
- Focuses on the child’s external world
- Language acquired through learning - imitation and reinforcement
- Language learning depends on domain-general cognitive abilities (general abilities that become specialised to language through learning)
- Children learn to construct the world through their own actions - not just passively learning language - want to make own sentences
What is the Interactionist perspective of language learning? (Vygotsky)
- Children are biologically prepared to acquire new language but maturation and the environment influence its development
- Gradually maturing nervous system shapes occurrence of universal ‘stages’ but still lots of plasticity in language acquisition
- Children are sensitive to clues to language but need social interaction to acquire it
What is the Developmental Systems approach to language learning? (Interactionist perspective)
Epigenetic interaction between genes and environment, cognitive systems shaped through learning and maturation across development
How does speech development differ between humans and primates?
- Infants are sensitive to speech - newborns can discriminate all the world’s speech sounds
- Compared to other species, human infants are extremely vocal
- Other primates are very quiet as infants
- Human infants communicate their core needs and stimulate social interactions
How does speech develop in the first 6 months of life?
Onset of speech-like non-cry sounds:
2 months - cooing (vowel sounds)
3-4 months - proto-phones (early speech sounds)
4-6 months - babbling begins
What is babbling? Is it culturally and species specific?
Babbling = meaningless speech sounds, extendable syllable repetition ‘ma-ma-ma’, ‘da-da-da’
- Babbling is culturally specific and they incorporate sounds from their native language
- Babbling is also evidenced in other species e.g. pygmy marmoset and greater sac-winged bat
- Co-operative breeding and social and vocal complexity link