Publications by authors named "Alexandra A de Sousa"

Background: Phylogenetics is one of the main methodologies to understand cross-cutting principles of evolution, such as common ancestry and speciation. Phylogenetic trees, however, are reportedly challenging to teach and learn. Furthermore, phylogenetics teaching methods traditionally rely solely on visual information, creating inaccessibility for people with visual impairment.

View Article and Find Full Text PDF

Virtual reality (VR) technology has been widely adopted for several professional and recreational applications. Despite rapid innovation in hardware and software, one of the long prevailing issues for end users of VR is the experience of VR sickness. Females experience stronger VR sickness compared to males, and previous research has linked susceptibility to VR sickness to the menstrual cycle (Munafo et al.

View Article and Find Full Text PDF

The process of brain folding is thought to play an important role in the development and organisation of the cerebrum and the cerebellum. The study of cerebellar folding is challenging due to the small size and abundance of its folia. In consequence, little is known about its anatomical diversity and evolution.

View Article and Find Full Text PDF

Alzheimer's disease (AD) is characterized by brain plaques, tangles, and cognitive impairment. AD is one of the most common age-related dementias in humans. Progress in characterizing AD and other age-related disorders is hindered by a perceived dearth of animal models that naturally reproduce diseases observed in humans.

View Article and Find Full Text PDF
Article Synopsis
  • Fossil endocasts provide insights into ancient brain features like size, shape, and structure, informing studies on brain function and development.
  • Interdisciplinary methods, including neuroimaging and genetic models, enhance the understanding of extinct species' brains and their related behaviors.
  • Sharing digital resources and databases fosters collaboration, enabling faster discoveries in paleoneurology, benefiting both biomedical and ecological research.
View Article and Find Full Text PDF

We sought to understand how the perception of personal space is influenced by different levels of social density, spatial density, and type of window-view in South Korean and United Kingdom workplaces. We employed virtual reality to simulate shared and single occupancy offices. We obtained personal space estimations using a virtual disc around the participant which could be extended and retracted, inside the simulation, to indicate perceived amount of personal space, and compared this measure to questionnaire-based estimations.

View Article and Find Full Text PDF
Article Synopsis
  • The Homo genus is characterized by a notable increase in brain size, with modern humans considered the pinnacle of this evolutionary trend.
  • Many studies emphasize the growing brain size in the Homo lineage but often overlook the brain sizes of smaller-brained hominins like Homo floresiensis and Homo naledi.
  • This review highlights the advantages of employing phylogenetic comparative methods to better understand the complexities of hominin brain evolution and the limitations of ignoring these approaches.
View Article and Find Full Text PDF
Article Synopsis
  • This chapter explores the connections between typical brain aging and neurodegenerative diseases like Alzheimer's and Parkinson's, highlighting aging as a primary risk factor.
  • Researching aging at both evolutionary and molecular levels can reveal why older individuals are more susceptible to these diseases.
  • The study indicates that while neurodegenerative diseases share some characteristics with typical aging, they differ molecularly and may represent an accelerated aging process in the brain.
View Article and Find Full Text PDF

Sex differences in mate preferences are ubiquitous, having been evidenced across generations and cultures. Their prevalence and persistence have compellingly placed them in the evolutionarily adaptive context of sexual selection. However, the psycho-biological mechanisms contributing to their generation and maintenance remain poorly understood.

View Article and Find Full Text PDF

This integrative review rearticulates the notion of human aesthetics by critically appraising the conventional definitions, offerring a new, more comprehensive definition, and identifying the fundamental components associated with it. It intends to advance holistic understanding of the notion by differentiating aesthetic perception from basic perceptual recognition, and by characterizing these concepts from the perspective of information processing in both visual and nonvisual modalities. To this end, we analyze the dissociative nature of information processing in the brain, introducing a novel local-global integrative model that differentiates aesthetic processing from basic perceptual processing.

View Article and Find Full Text PDF
Article Synopsis
  • Research on "blind" animal species helps us understand what vision does and how the brain processes visual information.
  • Models that combine evolutionary history and experimental studies can clarify the relationship between visual abilities and related behaviors, aiding in translating animal research to human vision treatments.
  • Analyzing the evolution of vision in vertebrates and comparing blind species offers insights into blindness and could inspire new approaches to managing vision loss in humans.
View Article and Find Full Text PDF

Objective: Neuroplasticity enables the brain to establish new crossmodal connections or reorganize old connections which are essential to perceiving a multisensorial world. The intent of this review is to identify and summarize the current developments in neuroplasticity and crossmodal connectivity, and deepen understanding of how crossmodal connectivity develops in the normal, healthy brain, highlighting novel perspectives about the principles that guide this connectivity.

Methods: To the above end, a narrative review is carried out.

View Article and Find Full Text PDF

Cross-cultural research has repeatedly demonstrated sex differences in the importance of partner characteristics when choosing a mate. Men typically report higher preferences for younger, more physically attractive women, while women typically place more importance on a partner's status and wealth. As the assessment of such partner characteristics often relies on visual cues, this raises the question whether visual experience is necessary for sex-specific mate preferences to develop.

View Article and Find Full Text PDF

Visual-to-auditory sensory substitution devices (SSDs) provide improved access to the visual environment for the visually impaired by converting images into auditory information. Research is lacking on the mechanisms involved in processing data that is perceived through one sensory modality, but directly associated with a source in a different sensory modality. This is important because SSDs that use auditory displays could involve binaural presentation requiring both ear canals, or monaural presentation requiring only one - but which ear would be ideal? SSDs may be similar to reading, as an image (printed word) is converted into sound (when read aloud).

View Article and Find Full Text PDF
Article Synopsis
  • The hippocampus has different regions with specialized roles, including CA2 which is linked to social cognition, while CA1 and CA3 relate to spatial cognition.
  • Research shows that the size of the hippocampus evolves alongside factors like group size and home range in primates, but diet does not significantly affect hippocampal volume.
  • There are also sex differences in hippocampal volume that correlate with body size differences, reflecting the influence of social structure and behavior on brain evolution in primates.
View Article and Find Full Text PDF

Humans have a bias for turning to the right in a number of settings. Here we document a bias in head-turning to the right in adult humans, as tested in the act of kissing. We investigated head-turning bias in both kiss initiators and kiss recipients for lip kissing, and took into consideration differences due to sex and handedness, in 48 Bangladeshi heterosexual married couples.

View Article and Find Full Text PDF

Increased brain size is thought to have played an important role in the evolution of mammals and is a highly variable trait across lineages. Variations in brain size are closely linked to corresponding variations in the size of the neocortex, a distinct mammalian evolutionary innovation. The genomic features that explain and/or accompany variations in the relative size of the neocortex remain unknown.

View Article and Find Full Text PDF
Article Synopsis
  • The article on page 64 in volume 7 has been corrected.
  • This correction addresses specific inaccuracies or updates relating to the original publication.
  • The relevant study can be found linked to the PMID: 26903893 for more detailed information.
View Article and Find Full Text PDF

Knowing who we are, and where we are, are two fundamental aspects of our physical and mental experience. Although the domains of spatial and social cognition are often studied independently, a few recent areas of scholarship have explored the interactions of place and self. This fits in with increasing evidence for embodied theories of cognition, where mental processes are grounded in action and perception.

View Article and Find Full Text PDF

Vision is the dominant sense for perception-for-action in humans and other higher primates. Advances in sight restoration now utilize the other intact senses to provide information that is normally sensed visually through sensory substitution to replace missing visual information. Sensory substitution devices translate visual information from a sensor, such as a camera or ultrasound device, into a format that the auditory or tactile systems can detect and process, so the visually impaired can see through hearing or touch.

View Article and Find Full Text PDF

Through advances in production and treatment technologies, transparent glass has become an increasingly versatile material and a global hallmark of modern architecture. In the shape of invisible barriers, it defines spaces while simultaneously shaping their lighting, noise, and climate conditions. Despite these unique architectural qualities, little is known regarding the human experience with glass barriers.

View Article and Find Full Text PDF

An overall relationship between brain size and cognitive ability exists across primates. Can more specific information about neural function be gleaned from cortical area volumes? Numerous studies have found significant relationships between brain structures and behaviors. However, few studies have speculated about brain structure-function relationships from the microanatomical to the macroanatomical level.

View Article and Find Full Text PDF

We describe an atypical neuroanatomical feature present in several primate species that involves a fusion between the temporal lobe (often including Heschl's gyrus in great apes) and the posterior dorsal insula, such that a portion of insular cortex forms an isolated pocket medial to the Sylvian fissure. We assessed the frequency of this fusion in 56 primate species (including apes, Old World monkeys, New World monkeys, and strepsirrhines) by using either magnetic resonance images or histological sections. A fusion between temporal cortex and posterior insula was present in 22 species (seven apes, two Old World monkeys, four New World monkeys, and nine strepsirrhines).

View Article and Find Full Text PDF

The lateral geniculate nucleus (LGN) of catarrhine primates - with the exception of gibbons - is typically described as a 6-layered structure, comprised of 2 ventral magnocellular layers, and 4 dorsal parvocellular layers. The parvocellular layers of the LGN are involved in color vision. Therefore, it is hypothesized that a 6-layered LGN is a shared-derived trait among catarrhines.

View Article and Find Full Text PDF

The neuronal composition of the insula in primates displays a gradient, transitioning from granular neocortex in the posterior-dorsal insula to agranular neocortex in the anterior-ventral insula with an intermediate zone of dysgranularity. Additionally, apes and humans exhibit a distinctive subdomain in the agranular insula, the frontoinsular cortex (FI), defined by the presence of clusters of von Economo neurons (VENs). Studies in humans indicate that the ventral anterior insula, including agranular insular cortex and FI, is involved in social awareness, and that the posterodorsal insula, including granular and dysgranular cortices, produces an internal representation of the body’s homeostatic state.

View Article and Find Full Text PDF