IB Psych 🧠 Flashcards
Biological Approach
The biological approach to studying behavior argues that there are physiological origins of many behaviors and that humans should be analysed in terms of their biology.
Explain one technique used to study the brain in relation to behavior with reference to one study
Intro: Modern day technology allows the technique of neuro-imaging to study the brain in relation to behavior in a non-invasive way. The Maguire study in the early 20th century demonstrated how cognitive processes may lead to plasticity in the hippocampus and it can be discovered through the MRI technique.
Body: MRI’s (magnetic resonance imaging) allows psychologists to look at the structure of the brain by applying a super strong magnetic field. Since the MRI causes protons to spin, different structures and tissues can be identified based on how fast the protons release energy. MRI’s neuro-imaging technique provides an indication of the brain structure without being too invasive. This was essential for the Maguire study to examine whether structural changes could be detected in the brain of people with extensive experience of spatial navigation. This determination would be based on if London Taxi drivers were somehow different as a result of their exceptional knowledge of London and many hours they spend navigating through the city. The procedure involved participants to be placed in a MRI scanner which focuses on the volume of grey matter inside the hippocampus. This was compared to a control group of non taxi drivers. The volume was measured based on the density of grey matter.
Results: The hippocampus, especially the right one, belonging to taxi drivers showed a greater volume of grey matter than the controls or non taxi drivers. Controls had more grey matter in their hippocampus than the taxi drivers did .The right hippocampus grey matter also had a positive correlation to the length of time spent as a taxi driver. This supported the theory of neuroplasticity: the ability of neural networks in the brain to change through growth and interaction with external stimuli. The only limitations were that majority of taxi drivers in London are males which makes it difficult to generalize the findings.
Conclusion: Through the use of the MRI, Maguire effectively observed the structures in the brain and found a correlation between the environmental effects on neuroplasticity, particularly around the hippocampus region which ultimately affects behavioral memory.
Explain localization of behaviour, with reference to one study.
Intro: Localization is the fact that the amygdala helps us feel fear. This can be seen in SM’s case study.
Body: Localization of function refers to the fact that different parts of the brain are responsible for different functions. The human bodies’ ability to activate our fear and flight or flight responses solely relies the amygdala. When our amygdala senses a threatening stimuli, it releases stress hormones like adrenaline and cortisol. The amygdala can detect environmental threats prior to humans being aware of its presence. This rapid response to threat is a biological change that increases ones chance of survival.
Body: The role of the amygdala in emotion was studied in the 1880s on studies involving monkeys and lesioning. However, after the modernized technique, the MRI, came to exist, psychologists started to study the amygdala and fear in humans. The importance of the amygdala in the fear response was showcased in Feinstein et al’s case study. The study asseses a women named ‘‘SM’’ who had bilateral amygdala damage due to a genetic condition. She suited the role for this particular case study since its rare for people to have damage only in their amygdala because it is hidden deep within the brain. Feinstein et al study was determined to discovered the amygdala necessary to detect fear, this they did a series of tests on SM. to feel fear so they did a series of tests and gathered data on SM. For instance, SM was placed in exotic pet store with dangerous surroundings including snakes, a haunted house and scary film clips. Although SM displayed no signs of fear, she did show other emotions such as enjoyment in the haunted house and laughter from the scary film clips.
Results: The researchers concluded that the amygdala function is to perceive threats and trigger a fear response. It’s function is is important since is serves as an internal safety feature. This can be further shown by the fact that the biographical details of SM found that she found herself in many dangerous situations.
Conclusion: One example of localization of function is the amygdala’s role in fear and this can be shown in SM’s case study.
Explain neuroplasticity, with reference to one study.
Intro: It was a long-standing belief that our brain development was fixed from a young age. However, animal research and modern technology used brain imaging to show how the brain can change throughout our lives.
Body: The Maguire study found correlations between driving taxis and brain development, particularly in the hippocampus, an area of the brain associated with learning and memory.
This correlation could be explained by stimulation: the neurons are connected to one another, creating neural networks as we learn new things. The brains ability to be altered during this experienced is known as neuroplasticity. To investigate the role of learning and memory on neuroplasticity in the hippocampus, the brains of London taxi drivers were compared with non-taxi drivers. Each participant was scanned using an MRI Hippocampus volume was measured using pixel counting. * resort to Maguire study as a result
Conclusion: This study demonstrated neuroplasticity in adult humans. However, the limits relied on the studies inability to determine if dendrite branching, neurogenesis or pruning has taken place in the hippocampus which would ultimately change the studies results.
These unsolved questions raises ethical concerns in humans, thus people should utilize animal studies.
Explain the effect of one neurotransmitter on human behaviour, with reference to one study.
Intro: Neurotransmitters are the body’s natural chemical messenger which transmits information between neurons. A neurotransmitter called serotonin relates to the humans aggressive and depressive behaviors. One example of how the neurotransmitter serotonin affects behavior was seen in the Kasamatsu and Hirai study.
Body: Serotonin regulates the body because of its ability to control bodily processes. The level of serotonin in ones body determines their emotions; the average level of serotonin prevents the presence of negative emotions while low levels can trigger negative emotions such as depression and aggression. The Kasamatsu and Hiri study used uses the effect of sensory deprivation: the lack of sensory stimulation, to see how serotonin affects behavior. They carried out this study in Japan with Buddhist monks who were forced to be in cold weather and avoid drinking, eating and talking. Considering how brutal this sounds, psychologists hoped to trigger negative emotions. About two days later, the men started hallucinating that their ancestors were present. Researcher took a blood sample and notes of the hallucinations.
Conclusion: The results of the study showed that the serotonin levels in the monks had increased. These negative emotions were triggered by the hypothalamus in the brain, resulting in the monks’ hallucinations. Sensory deprivation triggers a release of serotonin, which alters the way that monks see and behave in the world.
Explain one ethical consideration in one study of the brain and behaviour
Intro: Anonymity is an ethical consideration in that is relevant to understanding the impact of brain on human behavior. Anonymity importance is exemplified in the HM case study conducted by Milner.
Body: Confidential data that cannot be traced back to participants is known as anonymity. Anonymity gives the subjects the right to remain anonymous during the experiment. The study focuses on HM’s cyclist accident when he was a child and suffered from a serious brain injury. Following his operation, he was diagnosed with retrograde ameneisa which is a loss of memory for information acquired prior to the onset of amnesia. His condition prevented him from recognizing faces of individuals he saw on a regular basis. Since HM was such an unusual case, many wanted to study him and thus his anonymity could never be truly guaranteed.
Explain the use of one research method in one study of the brain and behaviour
Intro: Quasi experiment research is often used to study both the brain and its behaviors. In the HM study, conducted by Milner, the quasi method allows for a depth explanation for differences in brain activity
Body: Quasi-experimental research resembles experimental research, but differs because it’s not exactly true experimental research. Although the independent variable is manipulated, participants are not randomly assigned to conditions or orders of conditions. Quasi-experiments are mainly conducted in field settings in which random assignment is difficult or impossible. They are often conducted to evaluate the effectiveness of a treatment, particularly a type of psychotherapy or an educational intervention. In this circumstance, psycholigsts wanted to evaluate the brain of a patient dealing with a severe and rare case of retrograde ameneisa.
Conclusion: In Biological Analysis Research, testing is performed on individuals with abnormalities. The investigations results determine the make up of people without such abnormalities. Once someone is willing to be investigated, psychologists take this time to conduct exhaustive research in order to gain as much knowledge as possible. Quasi experiments are used to investigate those who it would be unethical to purposefully manipulate.
Explain the use of one research method in one study of the brain and behaviour
Intro: Quasi experiment research is often used to study both the brain and its behaviors. In the HM study, conducted by Milner, the quasi method allows for a depth explanation for differences in brain activity
Body: Quasi-experimental research resembles experimental research, but differs because it’s not exactly true experimental research. Although the independent variable is manipulated, participants are not randomly assigned to conditions or orders of conditions. Quasi-experiments are mainly conducted in field settings in which random assignment is difficult or impossible. They are often conducted to evaluate the effectiveness of a treatment, particularly a type of psychotherapy or an educational intervention. In this circumstance, psychologists wanted to evaluate the brain of a patient dealing with a severe and rare case of retrograde ameneisa.
Conclusion: In Biological Analysis Research, testing is performed on individuals with abnormalities. The investigations results determine the make up of people without such abnormalities. Once someone is willing to be investigated, psychologists take this time to conduct exhaustive research in order to gain as much knowledge as possible. Quasi experiments are used to investigate those who it would be unethical to purposefully manipulate.
Explain the role of one agonist with reference to one study.
Intro: One agonist is serotonin, which is a naturally occurring agonist of 5HT receptors. The effects of this on behavior on the brain can be shown in Passamonti et al.’s study.
Body: An agonist is a chemical messenger that binds to the receptor sites of neurons and activates them to create a response. Some drugs act as agonists of specific neurotransmitters. The connection between serotonin and behavior can be explained using Passamonti’s study whose aim was determined to see the effect of reduced serotonin on the prefrontal cortex when exposed to threat. Participants consumed a placebo drink or one lacking tryptophan which reduced serotonin levels. Participants were placed in an MRI machine and were exposed to faces with various different emotions. Participants who drank the serotonin drink had reduced function in their PFC when they were perceiving images of angry faces while in the MRI. Results showed that reduced serotonin disrupted the neural network communication between the amygdala and the PFC when viewing angry faces. The reduced function in the PFC when exposed to angry faces explains serotonin’s link with aggression; people can’t limit their natural and impulsive reactions to threats because serotonin controls the part of the brain that helps us to stop acting impulsively and they might react to threat violently.
Conclusion: If serotonin’s activity as an agonist on 5HT receptors is reduced, it can affect the transmission in important parts of the brain like the PFC and amygdala which would ultimately affect natural human behaviors.
Explain the formation of neural networks with the use of one study
The process by which neural networks are formed is called neuroplasticity. When a neuron is stimulated, an electrical charge travels down the axon. Neural networks are created when a neuron or set of neurons are repeatedly stimulated. When the neuron firing is repeated by potentiation, results in gene expression causes the neurons to sprout new dendrites known as dendritic branching. This increases the number of synapses available for the behaviour. The branching of neurons in the brain is called grey matter derives from the stimulation in the environment is seen in the Maguire study.
Maguire carried out a study to see if neuroplasticity would be seen in the brain of London taxi drivers due to the amount of time that they had been driving the streets of London. The hypothesis was that since they were required to pass a test called “the knowledge” which required them to memorize the location of key places and routes in the city and they spent a lot of time driving around the streets of London, repeated use of the brain for spatial memory would result in neuroplasticity and a denser hippocampus.
The taxi drivers were compared to the non taxi driving subjects. An MRI was used to detect changes in the structure of the brain as a result of their experience. The results showed that the taxi drivers had larger posterior hippocampus compared to the controls and that the controls had larger anterior hippocampus compared to the taxi drivers. There was also a positive correlation between the years of the participants had been as taxi drivers and the size of the posterior hippocampus, but a negative correlation existed in the size of the anterior hippocampus.
Maguire argued that this demonstrates the plasticity of the hippocampus in response to environmental demands and that the posterior hippocampus stores a spatial representation of the environment and that in the London taxi drivers the volume of the posterior hippocampus expanded because of their high reliance on navigation skills and spatial memories. By repeatedly firing the neurons required to remember the spatial layout of the city of London, the number of synapses was increased, creating a greater neural network.
Explain neural pruning with reference to one study.
Neural pruning refers to the process by which neurons and synaptic connections that are not frequently used are eliminated in order to increase efficiency of neural transmissions that are still functioning. Neural pruning results from the lack of long term potentiation in the brain which is the process by which synapses are strengthened resulting to dendritic arborization which is an increase in neural density. Both neural pruning and dendritic arborization result to brain neuroplasticity, which is the ability of the brain to change its structure as the individual interacts with their environment.
2) Neural pruning is best illustrated by Draganski’s study which involved participants were non - jugglers at the start of the
study and Draganski took a base MRI of their grey matter and brain structure. He then divided them into groups: a control and an experimental. The experimental group was taught a juggling routine and were asked to practice this routine and notify the researcher after they had mastered it. After mastering the routine, another MRI scan was taken of all the participants.
To analyse the scans, the researchers used voxel - based morphometry and found that the amount of grey matter in the mid - temporal area in both brain hemispheres of the jugglers was significantly greater than the brains of non - jugglers. This area is associated with visual memory, indicating that juggling relies on visual memory. This indiciates that dendritic arborization occurred in the mid temporal area while jugglers were practing their routine.
The participants were then asked to stop juggling and after many months, another MRI scan was taken. The researchers observed that the amount of grey matter in the experimental group had decreased but there was no change over time in the amount of grey matter observed in the control group. This shows that after the jugglers stopped practicing their routine, the synaptic connections that had taken place in their mid - temporal area were eliminated as they were not used anymore and neural pruning had occurred.
Explain the role of one antagonist with reference to one study.
An antagonist is a drug or chemical that binds to a receptor on a neuron and suppresses the agonist from attaching to the receptor and causing a response. A receptor is a site on the neuron that receives and reads chemical signals. One antagonist is scopolamine that inhibits the acetylcholine from attaching to the receptor which would cause new memories to form and short term memories to turn into long term ones.
Troster and Beatty study investigates the role of acetylcholine in the formation and retrieval of memory. 13 male particiapnts were tested for both physical and mental health. They were also informed of the potential side effects of scopolamine and reminded throughout the study that they could withdraw whenever they felt like. All the participants underwent the three conditions: a placebo group who were injected with saline solution or the other groups which contained other levels of scopolamine.
Many free recall tests where conducted to test the particpants’ ability to recall the objectives within each test. The concluding results showed that scopolamine played a role in inhibiting the formation of new memories but did not have a significant effect on the retrieval of long term memory. This showed that acetylcholine played a role in the encoding of both semantic and spatial memory.
Explain the effect of one hormone on human behaviour with reference to one study.
Chemical messengers released from glands throughout the body are implicated in human behavior. The pituitary gland in the brain manages hormone levels. One hormone maintained by the pituitary gland is oxytocin which ia hormone involved in behavior associated with maternal behavior and emotional recognition. The maternal effects of oxytocin can be determined through physical signs such as intense labor contraction and increase milk production. Additionally, oxycotin is thought to increase sociability and ability to empathize. The Kirkpatrick study investigates the immediate effects of MDMA (a recreational drug which increases empathy and desire for interpersonal closeness through the release of oxytocin) and oxytocin.Participants were given MDMA and oxytocin nasally, and a control group received a placebo. Their ability for emotional recognition (recognition of sad facial expressions) and sociability (desire for interpersonal closeness) was measured. The study found that the groups that received MDMA and oxytocin had elevated feelings of sociability and an augmented awareness of sad facial expressions. This suggests that in both situations, oxytocin was responsible for an increase in sociability and a positive perception of others.
Conclusion: The measurement of hormones is objective attributing to the strength of research since it means that the data is reliable. However, using hormones to explain the complexity of human behaviour, especially social behaviour, can be seen as a reductionist approach as it does not consider possible environmental, social and cognitive factors.
Explain one effect of one potential pheromone in human behavior with reference to one study
Intro: One study that demonstrates the role of pheromones in human behavior is Zhou et al (2014).
Body: Pheromones are chemical substances produced and released into the environment by an animal affecting the behavior or physiology of others of its own species. In Zhou et al (2014) study, homosexual and heterosexual males and female were asked to identify a non gendered stick figure, when being exposed to high level of pheromones, specifically androstadienone (male semen and sweat) and estratetraenol (female urine). Androstadienone - biased heterosexual females and homosexual males, toward perceiving the walkers as more masculine. Estratetraenol -biases heterosexual males and homosexual women toward perceiving the walkers as more feminine –> nfluence communication of gender information in a sex-specific manner.
Conclusion: This study conducted by Zhou et al (2014) have showed that pheromones, Androstandienone and estratetraenol, influence communication of gender information in a sex-specific manner, perception of masculinity and feministic traits.
Explain the use of one research method in one study of hormones or pheromones.
One research method used to evaluate the effect of hormones or pheromones on human behavior is the correlation study. The MAGUIRE TAXI CAB (1999) STUDY reflects this type of research method; Correlation studies can be used in the study of hormones or pheromones and behaviour by allowing researchers to compare results from a large or small number of participants in a more controlled environment. Hormone and pheromones are neurotransmitters that can impact biological functions and behaviour.
Explain one ethical consideration in one study of hormones or pheromones.
Ethical considerations are a set of rules that guide the science community on how to carry out an experiment or study mostly in order to minimize harm. One important ethical consideration is that participants should have a right to withdraw from a study at any point during the study.
The aim of McGaugh and Cahill’s study was to study the role of emotion on the creation of memories. Particpants were divided into two testing groups: one heard a rather boring, monotone story and the other group heard about an intense, engaging accident.
Two weeks after participating in the experiment, the participants were asked to come back and their memory for specific details of the story were tested. The test was a recognition task that consisted of a series of questions about the slides with three options for them to choose from.
In the original version of the experiment, the researchers found that the participants who had heard the more emotionally arousing story demonstrated better recall of specific details of the story. They could also recall more details from the slides. In the follow-up study, they found that those that had received the beta-blocker did no better than the group that had heard the “mundane” story. This study does not discuss whether the participants were protected from undue stress and harm. We are not told whether any of the participants suffering from psychological trauma by watching the traumatic slide or whether the propranolol causes any side effects that the participants were made aware of.
Explain the role of one gene in one behaviour with reference to one study.
One way that genetic inheritance can impact human behavior is by predisposing certain people to depression. CASPI ET AL is one study that displays how genetics affects human behavior in this way; The 5-HTT gene is suggested to be the base for depression and susceptibility to depression. Studies show that those with this gene are more likely to be depressed, thus displaying a link between genetics and human behaviour.
Explain how excitatory or inhibitory synapses play a role in one behaviour, making use of one study.
One inhibitory synapses that can impact human behavior involves serotonin. PASSMONTI ET AL displays how low levels of serotonin play a role in increasing aggressive behavior; An inhibitory synapse refers to a neurotransmitter that can prevent or limit a function. For example, serotonin can inhibit logical thinking and proper emotional responses, which increases impulsivity and thus aggression.
Explain how genetic similarities help psychologists in the study of genes and behaviour with reference to one study.
Genetic similarity is referred to as relatedness and it is assumed the greater the genetic similarities between two individuals or a group of individuals the higher the degree of relatedness.
STUDY 1: KEDLER et al. (2006)
IM: To investigate the heritability of depression
METHOD: Correlation (interviews; twin study)
Participants: 42000 twins from Sweden’s twin registry
Procedure: The participants were interviewed and assessed for major depressive disorder in accordance with DSM-IV
Results
The researchers estimated from the concordance rates in mono- and dizogotic twins that the heritability of depression is roughly 38% - The rate was higher in females. (MZ male - 31%: MZ female - 44%: DZ Males - 11% DZ females - 16%)
Conclusions
Depression is somewhat heritable, but environment and stress play at least a big a role (predisposition and stress: diathesis stress theory)
Explain one evolutionary explanation of behaviour with reference to one study.
One evolutionary explanation of human behavior indicates how fear developed in humans. Specifically, AHS ET AL displays how amygdala activation increases in response to fearful stimuli; Over time, the amygdala, a part of the brain responsible for emotional responses, will adapt to increased stimuli and fear. As time went on and animals were consistently presented with new threats, they evolved to have more responsive amygdalas that would in turn protect them.
Explain one ethical consideration in one study of genes and behaviour.
The biological level of analysis of psychology states that all cognitions, emotions and behaviours have a physiological basis. All psychological research needs to follow ethical guidelines. Ethics must be considered to ensure participants (humans and animals) are not harmed and that research conducted is ethically valid. Researchers should always conduct research in an ethical manner and studies should be critically evaluated for ethical issues.
In any study, the participants should be protected from any physical and mental harm and distress (humiliation, stress, injury etc.). Also participants should not be forced to reveal personal information. The researchers must inform all the participants about the nature of their research and an informed consent form must be signed. Sometimes it is not possible to give full information about research because it can lead to participant bias: knowing the true aims of a study may affect participants’ behaviour and thus the results of a study. Also it is considered acceptable not to give full informed consent if no harm is expected. Researchers should not delude their participants unless revealing full information will affect the validity of their work (participant bias) and slight deception is allowed if the deception does not cause any distress to the participant. In addition, participants should be informed of their right to withdraw their participation and data at any time in the study (even at the end) without penalty and stress. In addition, the findings of the research should be made available to participants as soon as possible