The alpha-1 adrenoreceptor antagonist prazosin has shown promise in the treatment of post-traumatic stress disorder (PTSD) symptoms, but its mechanisms are not well understood. Here we administered prazosin or placebo prior to threat conditioning (day 1) and tested subsequent extinction (day 2) and reextinction (day 3) in healthy human…

What can we learn from a pause? This dissertation examines whether a pause between speaking turns in a conversation (a gap) can change how we view that conversation and its participants (a gap effect). In particular, it asks whether the length of a gap can influence interactional attributions--that is, attributions of the participants' engagement…

Habituation is a non-associative form of learning characterized by a decremented response to repeated stimulation. It is typically framed as a process of selective attention, allowing animals to ignore irrelevant stimuli in order to free up limited cognitive resources. However, habituation can also occur to threatening and toxic stimuli,…

In immediate serial recall, participants are asked to recall novel sequences of items in the correct order. Theories of the representations and processes required for this task differ in how order information is maintained; some have argued that order is represented through item-to-item associations, while others have argued that each item is…

We form first impressions of many traits based on very short interactions. This study examines whether typical adults judge children with high-functioning autism to be more socially awkward than their typically developing peers based on very brief exposure to still images, audio-visual, video-only, or audio-only information. We used video and…

Aversive events can trigger relapse of extinguished fear memories, presenting a major challenge to the long-term efficacy of therapeutic interventions. Here, we examined factors regulating the relapse of extinguished fear after exposure of rats to a dangerous context. Rats received unsignaled shock in a distinct context ("dangerous"…

Purpose: We examined the effects of physiological arousal on speech motor control and speech motor practice effects in preschool-age children who do (CWS) and do not stutter (CWNS). Method: Participants included 18 CWS (M[subscript age] = 4 years 5 months) and 18 age- and gender-matched CWNS. The participants repeated a phrase "buy bobby a…

This study explored appropriate speaking activities for speakers of different proficiency levels by measuring the changes in their brain blood flow with near-infrared spectroscopy (NIRS). Fifty adult speakers and learners of English of various proficiency levels participated in the study by undertaking four types of task: a single-speaker picture…

Purpose: This study determines the effect of movement games on executive function among overweight children. Methods: Forty-four overweight children received an intervention of movement games, and 40 overweight children participated in original physical education lessons. An intervention of movement games was conducted three times a week for 8…

The present study was conducted to compare the performances of high-achieving sixth grade students on written computation, symbolic representation, and pictorial representation tests. The study enrolled 107 sixth-grade students in three schools. Data were analyzed by using the Kruskal Wallis and Mann Whitney-U Tests and interviews were conducted…

In individuals with Down syndrome (DS) deficits in verbal short-term memory (VSTM) and deficits in sentence comprehension co-occur, suggesting that deficits in VSTM might be causal for the deficits in sentence comprehension. The present study aims to explore the presumed relationship between VSTM and sentence comprehension in individuals with DS…

Based on the presupposition that visual literacy skills are not usually learned unaided by osmosis, but require targeted learning support, this article explores how everyday encounters with visuals can be leveraged as contingent learning opportunities. The author proposes that a learner's environment can become a visual learning space if…

Recent studies highlighted that autistic individuals show increased perceptual capacity -- the ability to process more information at any one time. This study examined whether there is a link between this increased perceptual capacity and the sensory hypersensitivity that many autistic people experience on a daily basis. In total, 38 autistic and…

Little research has examined the intersection of derived relations and observational learning, which may be an avenue by which an instructor can increase the total amount of learning while conserving instructional resources. In this study, we investigated this intersection in the context of teaching third-grade students…

A total of 97 monolingual and multilingual users of English participated in an adaptation of a matched-guise design to investigate the effect of visual cues (co-speech gestural intensity and facial expression) on perception of emotional intensity of the same speaker in two video stimuli in which verbal and vocal emotional information was kept…