Neurotypical

This is a single-arm, two-visit, non-randomized, cross sectional study identified as an intervention due to the use of a single bout of aerobic exercise to assess cerebrovascular function under the NIH rules. This study is not masked and its primary purpose is to develop a basic science understanding of the relationship between cerebrovascular health and balance control with aging. This study will involve 102 individuals classified as younger adults, middle-aged adults, and older adults who are neurotypical and cognitively normal. The primary outcome from a clinical trials perspective will be cerebrovascular response to a bout of aerobic exercise (i.e. change in cerebral blood flow with the performance of aerobic exercise on a recumbent stepper exercise machine). Non-interventional outcomes will be EEG measures of cortical activity and biomechanical kinetic and kinematic data recorded during standing balance reactions, as well as biological blood samples for genomic analysis.

This research explores how adults with autism make eye contact during formal and informal interactions; to what extent the nature of a conversation influences how eye contact is made in terms of length, frequency and overall presentation. Also what physiological responses to eye contact are, in order to determine to what extent eye contact leads to an increased, decreased or unchanged stress level. In addition, to gain insight into the similarities and differences in how people with ASD respond to eye contact of others compared to their own eye contact.

The goal of the study is to evaluate a new Autism Spectrum Disorder (ASD) diagnostic tool (Oxford Virtual Autism Assessment Tool (OVAAT)) to see whether it can: * Be able to identify autistic traits * Be able to distinguish between autistic and non-autistic young people * Is the tool better, similar or worse than another evidence-based observational tool (ADOS-2) in identifying features of autism?