Psychology Paper 1 Flashcards
Sensations
Processed by sense receptors which allow us to experience the world around us
Perception
Organization and interpretation of sensory information
Ponzo illusion
Horizontal line higher up appears longer.
than horizontal line in bottom
However both lines are actually the same size.
Müller–Lyer illusion
Two separate vertical lines of the same length, side by side, one with ingoing fins and the other with outgoing fins.
People perceive the vertical line with outgoing fins as longer than the vertical line with ingoing fins.
Rubin’s vase
Image of two faces and a vase in the same picture.
Both are correct so your brain can’t decide which one it is.
Ames Room
When two people stand on either side on the wall, one appears to be much bigger than the other even though they are both the same size.
Visual cues
Features of our environment that give up information about movement and distance.
Monocular depth cues
Allow us to judge depth with 1 eye
Examples of Monocular depth cues
Height in plane- Objects that are higher up in the visual field appear further away.
Relative size- smaller objects in the visual field appear further away.
Occlusion- Objects that are in front of others appear closer to us whilst objects behind other objects seem further away.
Linear perspective- When parallel lines converge in the distance, the point at which they come together is perceived to be further away.
Binocular depth cues
Allow us to judge depth with 2 eyes.
Examples of Binocular depth cues
Retinal disparity- each eye sees a slightly different image. They put these 2 images together and the difference between the 2 images help us judge depth. Difference(disparity)
Convergence- when our eyes follow an object coming towards us this causes our eyes to get closer together. Our eye muscles detect this change and send information to our brain.
Ambiguity
The brain cannot decide which one to choose, e.g. the Necker cube and Rubin’s vase.
Misinterpreted depth cues
If something is the same size but further away, our brain will tell us its bigger, e.g. Muller-lyer illusion, Ponzo.
Fiction
This is where a person perceives something in the illusion that is not there, e.g. Kanizsa triangle.
Size constancy
When objects appear to get smaller the further they are away and larger the closer they get, e.g. Ponzo, muller Lyer illusion
Describe Gibsons direct theory of perception
-No clear difference between sensation and perception
-The image that reaches the eye contains all the information needed to understand what we are looking at.
- Our eyes detect fine changes in light, texture, movement and depth so we can understand distance and depth
-We don’t need past experience.
- Optic flow patterns let our brain know we are moving.
Binocular and monocular depth cues are a vital part of perception as they enable us to judge depth and distance accurately.
-We do not need to learn to perceive the world around us as it’s innate.
Evaluate Gibson’s theory
A strength of Gibson’s theory is that it has real-world meaning.
Research was based on the experience of pilots from the Second World War.
This makes it more relevant to explain how we perceive the world on a daily basis.
A weakness of Gibson’s theory is that it struggles to explain visual illusions.
Gibson proposed that we will always perceive accurately whereas illusions trick the brain into misperception.
This suggests there is more to perception than his theory suggested.
A strength of Gibson’s theory comes from Gibson and Walk’s study.
They found that very few infants would crawl off a ‘visual cliff’.
This suggests that infants are born with an ability to perceive depth, which shows that some perception is innate.
Gibson’s theory provides a good explanation for how we are usually able to perceive quickly and
accurately in everyday life using information from the optic array.
Gibson’s theory has helped us to understand the richness of the optical information our eyes receive,
such as texture and colour gradient.
Evidence shows that factors such as expectation and culture affect perception. This challenges
Gibson’s theory and suggests that nurture (knowledge and past experience) also play an important role in perception.
Gregory’s constructivist theory of perception
-There is a clear difference between perception and sensation.
-Perception is a process of construction.
-We use past experience to make sense of the world around us, and fills gaps
-When making inferences, features of the environment (visual cues) give the brain information about depth, distance, etc.
- visual illusions occur because of misinterpreted visual cues ( brain makes wrong conclusions from visual cues )
-The more we interact with the world, the more sophisticated our perception becomes.
Evaluate Gregory’s theory
One strength is that Gregory’s theory has good support from studies that show cultural differences in perception.
Research in different parts of the world has found that people interpret visual cues differently (e.g. Hudson’s study).
This means that their different experiences have affected their perception.
One weakness relates to Gregory’s use of visual illusions to support his theory.
They are artificial two-dimensional (2D) images that are deliberately designed to fool us.
As a consequence, his theory may not tell us much about how perception works in the real world.
Another weakness is that Gregory’s theory cannot explain how perception gets started in the first place.
Research has shown that babies have some perceptual abilities at birth, such as they prefer human faces to random patterns (Fantz).
This suggests not all perception is the result of our experience.
Factors affecting perception- Motivation
Aim- Gilchrist and Nesberg aimed to find out if food deprivation affects the perception of pictures of food.
Method- Two groups of students: one group deprived of food for 20 hours and a control group (not hungry). Students were shown four slides, each one showing a meal. The slide was displayed for 15 seconds. The picture was shown again, but dimmer, and participants had to adjust the lighting to make it look the same as it did before.
Results- Participants perceived the food as brighter the longer they were deprived of food. The control group (who were not deprived of food) didn’t perceive the food as brighter.
Conclusion- Being deprived of food increased perceptual sensitivity. This shows that hunger is a motivating factor that affects the way food-related pictures are perceived.
Evaluate Motivation study
One strength is that similar studies have found similar results. Sanford deprived participants of food and showed them ambiguous pictures. The longer they were deprived of food the more likely they were to see food. This increases the validity of the Gilchrist and Nesberg results.
A problem with studies in this area is that they are unethical. This is because depriving participants of food and water could cause them to feel uncomfortable. This is an issue as you should not do this in psychological research.
A problem with the study is that it was not like everyday life. Participants were asked to judge pictures of food rather than real food. This makes it harder to apply the results to situations in the real world.
Factors affecting perception- Expectations
Aim- Bruner and Minturn aimed to find out whether an ambiguous figure was seen differently if the context of the figure was changed.
24 participants took part in an experiment on recognising numbers and letters using an independent groups design.
• Half of the participants were shown a series of letters with an ambiguous figure in the middle. The other half were shown a series of numbers with the same ambiguous figure in the middle.
• The ambiguous figure was a broken ‘B’ that could be seen as either the letter B or the number 13.
• Most of the participants who had been shown numbers drew a ‘13’. Most of the participants who were
shown letters drew a ‘B’.
• The researchers concluded that the participants’ expectations had directly affected how they
interpreted the ambiguous figure.
• This shows that expectation affects perception.
Evaluation of Expectation study
This is a laboratory-based study, so people were perceiving figures under highly controlled conditions.
• This is useful for the researcher who has eliminated many extraneous variables so can be sure the IV
has affected the DV if the results show an effect.
• Procedures are standardised so the study can be replicated.
• Laboratory-based studies are often carried out in artificial settings. This means there is a lack of ecological validity.
• Laboratory-based study often use artificial tasks (such as interpreting ambiguous images). Because people do not normally have to do these, this can reduce the validity of the results.
• High control can decrease the validity of the results because it increases the artificiality of the
performance of the participants. This means it is difficult to generalise research findings to predict behaviour in a more normal setting.
One strength of this study is that it has real-life application. It can explain errors that people make as the results suggest that expectations can influence perception. This helps to explain why people make sometimes serious mistakes on tasks in the real world.
Memory
Encoding: means to change information into a form so it can be stored in the brain.
Storage: the information is then kept in your memory store for a period of time - possibly a lifetime.
Retrieval: the information has to be located and brought back out of your brain.
This can be done through recognition (e.g. multiple choice identifying through options) , cued recall (given a clue to remember something you are close to remembering) or free recall (without cues).
3 processes
Memory involves three processes: → encode → store→ retrieve
Types of encoding:
> Visual encoding - Changing information by how it looks so it can be stored.
> Acoustic encoding - Changing information by how it sounds so it can be stored (what you hear).
> Semantic encoding - Changing information by its meaning so it can be stored. Your ability to understand and use words and concepts.
Long term memory
Episodic memory - Your memory for events (episodes) from your life. It’s your memory for things you have done and experiences you have had. E.g. your 10th birthday party.
Semantic memory - Memory about what things mean, it is the meaning of everything you know. E.g. the capital of France is Paris.
Procedural memory - This is muscle memory, remembering how to do things.
- Episodic and semantic memories are declarative as they need conscious recall.
- Procedural memory doesn’t require conscious recall so this is non-declarative.
Evaluation of LTM
One strength is that dividing LTM into different types is that brain scans have shown different locations for each type of memory supporting the idea of different kinds of memory.
Episodic - right prefrontal area. Semantic - left prefrontal area. Procedural - motor area.
One strength is that people who experience memory loss due to brain damage lose only certain types of memory such as Clive Wearing.
He lost most of his episodic memory but not his procedural as he could still play piano, this shows there are different kinds of memory.
One weakness is that distinctive types of LTM are difficult to separate. There isn’t a clear difference between semantic and episodic memories because memories are usually a mixture.
Therefore, having three separate types of LTM may be an oversimplification.
Multi store model
Sensory memory - Information received by senses, attention transfers this information into STM. Very short duration, large capacity.
STM - Temporary memory store with limited capacity of +- 7 pieces of information lasting up to 30 seconds. Tends to be acoustic.
LTM - Permanent memory store, encoding tends to be semantically and this has unlimited capacity and can last a lifetime.
Evaluation of Multi store model
One strength is that there is evidence backing different types of memory stores.
The model is supported by Baddeley’s study of encoding which shows that STM and LTM encode information differently.
This shows the two types of memory have qualitative differences.
One weakness the model suggests we only have one STM and one LTM. Yet there is research showing STM is divided into visual and acoustic stores and LTM into episodic, semantic and procedural stores.
This suggests that our memory is more complex than the model proposes.
One weakness is that the studies in the 1950s and 60s tended to use artificial memory tasks.
For example word lists or nonsense syllables. This means the results would not illustrate the different ways we use memory.
The multi-store model of memory does not explain how you can remember some information even though you have not rehearsed it and also struggles to explain why we can forget information that we
have practised and rehearsed.
Murdocks study
Aim - Murdock set out to see if memory of words was affected by the number of words a person had to remember.
Method - Words from the 4,000 most common words in English were chosen randomly.103 participants listened to 20 word lists with 10 to 40 words on them. They were asked to recall the words after each list had been heard.
Results - He found that the likelihood of recall was related to the position of the word in the list. Participants had higher recall for the first few words (primacy effect) and the final few words (recency effect), compared to words in the middle of the list.
Conclusions - This shows the serial position effect, i.e. the position of a word determines the likelihood of recall.
These results support the MSM as the first few words were rehearsed, so are in LTM, and the last few words are in STM.
> Primacy effect - Words at the beginning of a list are remembered more as they have been rehearsed and have become long-term memories.
Recency effect - Words at the end of a list are remembered more as they have been heard recently so are in short-term memory.
Evaluate Murdocks study
One strength is that the study was conducted in very controlled conditions which means we can trust the results.
Things like the familiarity of words or speed of reading were controlled so none of these things can affect the DV and show the real cause and effect. Therefore, we can be more certain it was the position of the words that affected recall.
One weakness is that as memory was investigated by using word lists it only represents a small part of what we do with our memories.
This research only tells us about one aspect of memory.
Therefore, the results don’t relate to how we use our memories in other ways, such as for personal events.
One strength Research with amnesiacs supports the conclusions.
Carlesimo et al. found that some amnesiacs can’t store long-term memories and do not show a primacy effect but do show a recency effect.
This shows that the primacy effect is related to long-term memory.
Bartlett’s War of the Ghosts study
Aim - Bartlett investigated how memory is reconstructed when people are asked to recall an unfamiliar story, in particular a story from a different culture.
Method - He showed participants the story and asked them to reproduce it shortly after (15 minutes). He then showed the new version to another participant and asked them to recall it a short time later, he repeated this further. Bartlett kept a record off all successful recall. A key feature of the story was that it belonged to a very different culture from that of his participants.
Results - Bartlett found participants remembered different parts of the story and that they changed the story to fit within their own social and cultural expectations. They left out information that they were less familiar with. The story was shortened and phrases were changed to those used in the participants’ own culture. For example changing “canoes” to “boats”.
Conclusion - Memory is a reconstruction as we don’t remember the details but remember the main/ important fragments. We then use our knowledge to add details that fit to our culture and social knowledge. This reconstructed version of events is simpler and easier to remember and therefore becomes our memory for the event.
Evaluate Bartletts study
One weakness is that this study was conducted rather casually with no set standards about recall.
Participants were not given specific instructions at the outset about what they should do.
Another study found that recall was higher when they were told accurate recall was important.
This suggests that recall is probably more accurate than Bartlett suggested.
One weakness is that Bartletts own beliefs were likely to have affected the way he interpreted the data.
He analysed each recall and determined what was accurate recall or not. Since he believed recall was to be affected by cultural expectations, he may have been more likely to see this kind of effect in results.
Therefore, we cannot fully trust the validity of his results and conclusion.
One weakness is that recall of the story may not reflect everyday memory processes.
These would not be affected by cultural expectations and therefore, we may recall quite accurately.
Therefore, this study tells us little about everyday memory.