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Projects

BabyFaceSpeech


M.Sc. Anna Krasotkina and Dr. Julia Dillmann

In this project, we investigate the interaction between face and speech processing in monolingual and bilingual infants. For this purpose, we present European or Chinese faces, combined with either German or French sentences to the infants. We measure infants gaze behaviour using an eye tracker.

 

Collaborators:              

Prof. Dr. Olivier Pascalis, Université Grenoble Alpes CNRS

 

This project is funded by the DFG (German Research Foundation).

 

 

 

Interactions between face and speech processing


M.Sc. Özlem Sensoy and M.Sc. Anna Krasotkina

In this project, we are interested in the underlying mechanisms and interactions of perceptual narrowing. Perceptual narrowing describes a process that takes place in the speech and face perception between 6 and 9 months of age. Newborn and young infants are e.g. able to discriminate equally successful between native and non-native sounds. At the end of the first year of life, infants get better in discriminating sounds of their native language but can’t do so anymore with non-native sounds. In the first funding period, we demonstrated that perceptual narrowing in speech and face perception is strongly connected and influenced by similar processes. Moreover, we found indications that perceptual narrowing is reversible under certain circumstances. In the second funding period, we are interested whether speech and face perception is still strongly connected in older children or whether with increasing age speech and face perception get more and more separated. We also investigate whether and under which circumstances perceptual narrowing is also reversible for older children.

 

Collaborators:    

Prof. Dr. Barbara Höhle, Department of Psycholinguistics/Language Development, Potsdam University

Antonia Götz, Department of Psycholinguistics/Language Development, Potsdam University

 

This study is funded by the Research Unit 2252 “Crossing the Borders” of the DFG (German Research Foundation).

 

 

 

The development of the interplay of verbal and facial information in emotion categorization


Dr. Michael Vesker

In this project we study how children develop the ability to combine information from faces and words to perceive emotions. More specifically, we study how the emotional categories of faces and words (whether they are positive or negative) influence the ability of children and adults to correctly classify them. As part of our experiments we use behavioral methods which tell us how quickly and efficiently participants can classify emotional information, as well as eye-tracking, which can tell us how participants visually scan pictures and videos of faces. Thus far, we have discovered that children initially process positive words and faces more efficiently than negative ones, and gradually increase their efficiency of processing negative information as they grow up.  We also found that accompanying words have a stronger influence on the classification of faces than accompanying faces have on the classification of words. Currently, we are also investigating the above factors in children with Autism Spectrum Disorder and Developmental Language Disorder in order to determine how these conditions can influence the development of emotion perception. 

 

Collaborators:    

Prof. Dr. Christina Kauschke, Clinicals linguistics research group, Marburg University

 

This study is funded by the SFB/TRR 135 of the DFG (German Research Foundation).

 

 

 

Emotional categorization and crawling


Dr. Michael Vesker and M.Sc. Gloria Gehb

Existing studies have shown that infants can distinguish happy faces from sad or anxious faces as early as 5 months of age.  However, the extent to which an emotional facial expression needs to be positive or negative to be perceived as such by infants has not yet been sufficiently investigated. In one study, 7-month-old infants were able to distinguish a face that was 60% anxious and 40% happy from a 100% happy face. Another open-ended question is also in how far other skills such as crawling or walking influence infants’ ability to perceive emotional expressions properly. As soon as babies start to move independently the interaction between parents and their children changes. Once babies can move to objects that may be breakable or dangerous on their own parents might show negative emotions such as fear or anger more frequently. Thus, crawling or walking infants might be more often confronted with negative emotions than infants who cannot move independently yet. For this reason, the current study aims to investigate whether infants who are already able to move independently are more sensitive to changes in emotional facial expressions than infants of the same age who cannot crawl or walk yet.

In order to answer this question, the infants in our study are presented with a pair of faces in which one is 100% happy and the other contains a variable mixture of happy and negative emotions. By using an eye-tracker (a device that records the eye movements) we can determine whether infants can tell the two faces apart.

 

This study is funded by the SFB/TRR 135 of the DFG (German Research Foundation).

 

 

 

How children recognize emotions from body movements


M.Sc. Lucie Preißler

Just as with faces, we can reliably recognize different emotions from the posture and body language of other people. Particularly in situations with limited sight of other people's faces, for example at dusk, in crowds or at greater distances, we can recognize their emotions and intentions from body movements. It is also known that the recognition of emotions from faces in adults is influenced by posture. Adults evaluate the same face differently depending on the body language of the person shown. It is also known that we can still recognize body movements even when we see very little of the actual person. So-called point-light displays show light points that are attached to the joints of persons. They no longer contain structural information such as body contours, but still contain movement information. Just a few days after birth children prefer to look at such human representations instead of a random arrangement of points. At the age of 3 years children can recognize the actions of people in point-light displays and at the age of 5 years children are almost as good at recognizing them as adults. In our department, we are interested in when emotion recognition from body movements develops in children. In particular, we are investigating the role of interactions between two persons for emotion recognition. For this purpose, we show children point-light displays of two interacting persons and compare it to the reaction of children with representations of only one person. To detect unconscious emotion recognition, we use a surface electromyogram to record small muscle activities in the face. An activity in the cheek muscles is for example shown when a child smiles and can be observed as a reaction to a cheerful video. Furthermore, we are interested in how emotion recognition from body movements is related to speech development, empathy and social competence.

 

This study is funded by the IRTG 1901 “The Brain in Action” of the DFG (German Research Foundation).

 

preißler_1

Example of a Point-Light-Display

 

 

 

Perception and Action


PD Dr. Bianca Jovanovic

Perception and action, though usually regarded as separate systems, are deeply entwined. Even the most elementary action, like grasping an object, requires a perceptual analysis, such as, for example, of the object’s position in space, in order to be successful. Exactly how this interplay between perception and action develops, that is, how infants and children manage to coordinate perception and action, is one of our central research questions.

Another important issue motivating our research is the development of action planning. Here, we are especially interested in the development of infants’ ability for anticipatory grasp adaptation to different object features like orientation or size. Moreover, we look at the development of toddlers’ and children’s anticipatory adaptation to task demands arising in the context of multi-step actions. One example of such adaptation seen in adults is the end-state comfort effect: when grasping objects, adults adapt their initial hand orientation to insure a comfortable posture at the end position, accepting an uncomfortable orientation at the beginning. The aim of our current research is to better understand the developmental course of efficient grasping and its underlying factors.

Last, but not least, a significant number of our studies has concentrated on issues of action perception. From birth, babies are surrounded by a wealth of social information. Our principal research question in this context has been, when infants begin to regard the actions they see as goal-directed and, which cues can help them understand the underlying structure of people’ s actions.

 

 

 

Predictive grasping and manual exploration


M.Sc. Gloria Gehb

Based on existing findings, it is known that within the first half of the first year of life babies are able to look at the location where an object which moved behind another object and thus was temporarily covered will reappear. Therefore, infants can predict where the object will be visible again. However, it has been shown that for infants, it is more difficult to reach predictively for the location where an object will reappear. Only with 8 months of age, infants are able to reach for the location where an object will reappear at the right time and thus succeed in holding on to a ball that for example rolled behind the sofa. However, studies are missing on the grasping behavior of infants when an object does not move in a straight line and along the horizontal axis. It is also unknown whether interactions with other abilities, such as exploratory behavior with the hands, affect the ability of predictive grasping. It has already been shown that infants who explore toys with their hands frequently (e.g. rotating,  haptic scanning or passing from one hand to the other) are better at looking predictively at the location where an object will reappear than infants who rarely do so. For this reason, we investigated how individual manual exploratory actions affect the predictive grasping behavior.

In one task, infants saw a large and a small sphere being alternately covered and uncovered as they moved up and down along a circular path. The babies had the chance to reach for these balls. The second task was realized to assess the manual exploration behavior. In this task the babies were offered 5 age-appropriate toys in turn for a certain amount of time and they could play with them.

We found that infants who frequently scanned the surfaces and edges of a toy with their fingers had a higher prediction rate in the predictive grasping task. Thus, the infants started to initiate their grasp at the right time. Dealing with objects by scanning their surfaces and edges seems to have a positive influence on the general understanding of object properties.

 

This study is funded by the SFB/TRR 135 of the DFG (German Research Foundation).

 

gehb_1

Examples for the toys used in the manual exploration task

gehb_2

Example of the experimental set-up in the predicitve grasping task 

 

 

 

How material properties influence grasping movements


M.Sc. Lucie Preißler

Without ever having touched an object in advance, we are able to estimate how heavy an object is, how smooth or rough it feels and how soft or rigid its surface is. We have a vivid imagination of material deformability and how various surfaces appear in different shapes and lighting. Identifying different material properties correctly helps us to decide whether an edge is sharp, how ripe an apple is or how creamy and hot a soup is. Such information about material properties makes it easier for us to control our body movements when we get in contact with the object. For example, we know how many fingers we need to grasp an object efficiently or how powerful our grasp should be. Only with knowledge about material properties we succeed in grasping without squashing or dropping an object. In our experiments, we investigate how infants perceive and recognize different object properties and how they use them for the execution of an appropriate grasping movement. We are interested in the impact of visual and haptic information about material properties and how infants use these cues to adjust their grasping movements in anticipation. Furthermore, we examine hand kinematics such as acceleration, speed and hand aperture.

 

preißler_2

Schematic illustration of our experimental set-up

preißler_3

Depiction of the object used in the study

 

 

 

Gaze behavior and crawling


M.Sc. Amanda Kelch and M.Sc. Gloria Gehb

Some studies have already dealt with the relationship between crawling and performance in search tasks in infancy. Other studies have also examined where babies look at while crawling. These studies showed that babies who have been able to crawl for a long time performed better in search tasks than babies of the same age with little or no crawling experience. However, it has not yet been investigated whether infants with and without crawling experience differ in their search performance when they are familiarized with a room in the same way and in the same position. Furthermore, the question remains open whether infants with and without crawling experience differ in their gaze behavior when they encounter a new room.

In a current study, we try to answer these questions by pushing infants sitting in a baby walker through a room with various attractive objects that infants can look at. Afterwards the objects are changed and the babies are pushed through the room for a second time, now with new objects. A mobile eye tracker (a headband with a kind of camera attached to it) is used to record where the babies are looking at.

 

This study is funded by the SFB/TRR 135 of the DFG (German Research Foundation).

 

gehb_4

Example of experimental set-up

 

 

 

Perception and Processing of Sizes in Infancy


M.Sc. Özlem Sensoy

In one of our projects, we are investigating when and under which circumstances infants exhibit knowledge of the familiar size of objects. When we talk about familiar size, we mean the typical size an object has.

Infants are confronted with objects of different sizes on a daily basis. They are surrounded by toys that are much smaller or larger than their familiar-sized real-world counterparts. A dollhouse e.g. is a scale model for a real-world house. As adults, when we encounter an apple the size of a watermelon, we would be puzzled. Infants, however, might not be puzzled about the watermelon-sized apple as they first have to learn the familiar sizes of various things.

In our daily lives, however, we not only encounter real objects but also pictorial representations of objects. In pictures the sizes of objects can differ from their familiar sizes even more. In a picture book the picture of a cat can be rendered the same size as the picture of a tiger. Past studies have shown that adults demonstrate knowledge of the familiar size of objects when presented with real objects as well as pictures. In our current project, we investigate when and under which circumstances infants exhibit knowledge of the familiar size of common objects. Therefore, we present 7- to 15-month-old infants sippy cups and pacifiers in their familiar size and novel sizes as real objects and pictures of those.

 

Collaborators:  

Prof. Dr. Jody Culham, Department of Psychology, Brain and Mind Institute, Western University, London, On, Canada

 

This study is funded by the IRTG 1901 “The Brain in Action” of the DFG (German Research Foundation).

 

sensoy_1

Example of the presented objects in the three different sizes: Mini-, familiar and Maxi-Size (from front to back)


sensoy_2

Example of our experimental procedure: an infant is viewing a picture of a sippy cup in the Maxi- (left) and in its familiar size (right)

 

 

 

Mental Rotation and Action Experiences

 

Mental rotation describes our ability to rotate an object that we see in our minds. This is an important spatial-cognitive skill even for babies and allows them to recognize a particular object when different views of it are presented to them.

Past studies from our group aimed at determining if and when babies are capable of such mental rotation processes. We were particularly interested in determining if there are specific factors that facilitate the acquisition of the skill. Results from these studies showed that motor actions such as the ability to move around independently or to manually explore objects in a sophisticated manner enhance infants‘ mental rotation ability.

 

Dr. Theresa Gerhard

In our current project we want to take a closer look at this beneficial relationship between motor actions and mental rotation ability in infants. We ask ourselves whether infants with advanced motor skills are better in perceiving and utilizing self-induced spatial information from their surrounding when mentally rotating objects. 

 

gerhard_1gerhard_2

left: example for a rotation object, right: Infants are allowed to rotate these cylinders and get information which is relevant or irrelevant for mental rotation

 

M.Sc. Amanda Kelch

In another study on mental rotation we want to investigate if the way infants explore objects impacts their ability to mentally rotate objects. In this study infants can manually explore the rotation object (e.g. rotating it or scan the surface with their fingers) prior to the mental rotation task. Here, we want to find out if the quality of exploration, that means the way infants explore an object, is relevant for recognizing objects from different perspectives.

 

This study is funded by the SFB/TRR 135 of the DFG (German Research Foundation).

 

kelch_1

Infant exploring rotation object manually

 

 

 

Mental Rotation and Locomotion Training

 

M.Sc. Gloria Gehb

Previous studies investigated the relation between crawling and mental rotation in 9-month-old infants. These studies showed that infants who had been crawling for a longer time period performed better in mental rotation tasks than same-aged infants with little or no crawling experience. However, it is still unclear which components of crawling influence mental rotation abilities in infants. For this reason, 7-month-old infants without any crawling experience were trained in their locomotion. One group was able to move independently with the help of a baby walker. The other group also sat in a walker but was pushed around the room. The babies had the possibility to get the same visual impressions but only one group had the possibility to get self-induced locomotion experiences. A third group received no training at all and only completed mental rotation task. Infants mental rotation abilities were assessed before and after the three-week training period to detect potential changes.

We found that the infants who were able to move in a self-induced way during the training period showed a better mental rotation performance after the training than before. However, the group that was only pushed through the room and the group that received no training did not show any change in their mental rotation performance. It can therefore be assumed that the interaction of visual and locomotion experiences has a positive influence on the mental rotation performance.

 

This study is funded by the SFB/TRR 135 of the DFG (German Research Foundation).

 

gehb_3

Example of the object rotation in the mental rotation task 


gehb_4

Example of the experimental setup




2D-3D Perception


Dr. Theresa Gerhard

Within the framework of the International Research Training Group “The Brain in Action”, we are interested in answering the following questions:  Are infants able to understand the difference between a real object (3D) and its two-dimensional counterpart (2D)? Is this understanding innate to human object recognition or is it learned by successful attempts to interact with real objects, and failed interactions with depicted objects? Being an adult, it seems to be quite easy to tell the difference between a real object and its corresponding 2D object. For example, we would never try to drink out of a depicted coffee cup. However, it is still unclear, when and especially how infants acquirethis kind of understanding. To provide new insights into the development of infants` 2D-3D perception abilities, a series of studies will be carried out in close collaboration with the Canadian research group of Prof. Dr. Jody Culham, addressing the questions mentioned above.

Collaborators:
Prof. Dr. Jody C. Culham, University of Western Ontario, London, Canada
Dr. Jacqueline C. Snow, University of Western Ontario, London, Canada

 


 

 

Clubfoot


Dr. Julia Dillmann

In this project, we are interested in the development of children with congenital idiopathic clubfoot. We are particularly interested in the development of spatial-cognitive, language, gross and fine motor skills in the first years of life. Another important issue motivating our research is the social and emotional development. Additionally, we address the question how the parents deal with the impairment of their children.

 

Collaborators:

Dr. med. Christian-Dominik Peterlein, Mühlenkreiskliniken Bay Oeynhausen

Dr. med. Ute Brückner, Klinik für Kinderchirurgie und -urologie Klinikum Bremen-Mitte

 

 

 

MoViE


Dr. Julia Dillmann 

The aim of this project is to investigate the development of motor, spatial cognitive and perceptional skills of children with congenital strabismus/esotropia. Additionally, we are interested in their social and familial development and the effects of late surgical correction of strabismus.

 

Collaborators:

Prof. Dr. Birgit Lorenz, Augenklinik der Universitätsklinik Gießen

 

 

 

Music and Cognition


M.A. M.Ed. Ulrike Frischen


Does making music make you smart?

This is exactly what we are investigating in our current projects.

 

Do music lessons enhance intelligence in primary school children?

Some studies indicate that children who take music lessons achieve better results in intelligence tests than children who do not take music lessons. However, it is still unclear whether smarter children are more likely to learn an instrument or whether music lessons influence cognitive performance. There are very few high-quality studies yet suggesting that music lessons can cause an improvement in the? performance of? an intelligence test. Therefore, in a current study, we would like to investigate whether learning an instrument enhances intelligence in primary school children and whether comparable leisure activities, such as drawing, show a similar effect.

 

What mediates the relationship between music lessons and intelligence?

Some studies have shown a positive correlation between music lessons and intelligence. Our aim is to investigate this relationship more in depth. We have shown that, for example, so-called executive functions* (e.g. planning, selective attention, inhibition and cognitive flexibility) can explain part of this relationship. In our current projects, we are investigating the relationship between music lessons, executive functions and intelligence across different age groups. We are also interested in whether there are other mediating variables besides executive functions. 

 

Do music lessons enhance executive functions in childhood?

Previous studies have shown positive associations between music lessons and various executive functions such as selective attention, working memory, inhibitory control or cognitive flexibility. However, there is still a lack of studies that provide evidence for the positive influence of music lessons on executive functions. Current research in our department suggests that making music in childhood can enhance executive functions Based on this, we are now interested in whether different musical activities such as singing, dancing or rhythm training influence executive functions in different ways. First results show that rhythm training compared to singing training or sports training enhances motoric inhibition in pre-school children.  In upcoming studies, we would like to investigate these findings more in depth.

 

*Executive functions are general cognitive abilities that we need in order to control our attention and to concentrate. They enable us to think and act in a goal-oriented manner.

 

Collaborators:  

Dr. Franziska Degé, Max Plack Institute for Empirical Aesthetics, Frankfurt am Main

 

This project is funded by a grant of the DFG.