The principals of meaning: Extracting semantic dimensions from co-occurrence models of semantics

Notable progress has been made recently on computational models of semantics using vector representations for word meaning (Mikolov, Chen, Corrado, & Dean, 2013; Mikolov, Sutskever, Chen, Corrado, & Dean, 2013). As representations of meaning, recent models presumably hone in on plausible organizational principles for meaning. We performed an analysis on the organization of the skip-gram model’s semantic space. Consistent with human performance (Osgood, Suci, & Tannenbaum, 1957), the skip-gram model primarily relies on affective distinctions to organize meaning. We showed that the skip-gram model accounts for unique variance in behavioral measures of lexical access above and beyond that accounted for by affective and lexical measures. We also raised the possibility that word frequency predicts behavioral measures of lexical access due to the fact that word use is organized by semantics. Deconstruction of the semantic representations in semantic models has the potential to reveal organizing principles of human semantics.     

Temporal integration of acoustic and cutaneous stimuli shown in the blink reflex

Temporal integration of pairs of brief blink-eliciting acoustic and cutaneous stimuli was investigated to determine if there was integration of stimuli from different modalities. Reflexes elicited by a tone burst or by a brief electrical shock to the supraorbital nerve followed by a second tone burst or shock at short stimulus onset asynchronies (SOAs) were larger and faster than control reflexes elicited by a single stimulus identical to the lead stimulus of the stimulus pairs. Reflex amplitude was augmented at longer SOAs where there was no effect on latency. Temporal integration was evident for all stimulus pairs, showing that it is due, at least in part, to processes that occur outside specific sensory pathways. Heterogeneous stimulus pairs produced greater reflex enhancement than did homogeneous stimulus pairs. This finding was examined further in Experiment 2, which showed that reflex enhancement with pairs of acoustic pulses was unaffected by the frequency of the second stimulus, suggesting that sensory masking was not acting to suppress reflex expression with acoustic pulse pairs. Integration of reflexogenic acoustic stimuli shown in the blink reflex is restricted to shorter intervals than is integration of acoustic stimuli shown by psychophysical procedures, suggesting that the two methods reflect different aspects of stimulus processing. Integration of reflexogenic stimuli may result from summation of activity associated more directly with reflex expression than with perceptual awareness.     

Can spirituality be taught to health care professionals?

Although people with life-limiting conditions report a desire to have spiritual concerns addressed, there is evidence that these issues are often avoided by health care professionals in palliative care. This study reports on the longitudinal outcomes of four workshops purpose-designed to improve the spiritual knowledge and confidence of 120 palliative care staff in Australia. Findings revealed significant increases in Spirituality, Spiritual Care, Personalised Care, and Confidence in this field immediately following the workshops. Improvements in Spiritual Care and Confidence were maintained 3 month later, with Confidence continuing to grow. These findings suggest that attendance at a custom-designed workshop can significantly improve knowledge and confidence to provide spiritual care.     

Upon Reflection

I report on the fate of three methodological and metatheoretical ideas introduced by Brunswik roughly half a century ago. All were greeted with more than the usual hostility because they challenged the conventional beliefs of the time. All have survived in unexpected ways. I also address certain sins of commission and omission made during the neo-Brunswikian phase of the development of Social Judgement Theory. My hopes and fears for the future are mentioned     

The Effect of Motor Preparation on Changes in H Reflex Amplitude During the Response Latency of a Warned Reaction Time Task

Monosynaptic Hoffman reflexes (H reflexes) were recorded from the soleus muscle during the response latency of a warned reaction time (RT) task that required plantarflexion of the foot. The task was done under four conditions of predictability of the response signal (RS), created by the factorial combination of foreperiod duration (1 and 4 s) and variability (fixed and variable). RT varied systematically with RS predictability and was facilitated in conditions that favored prediction of the RS. The response latency was divided into two successive phases by the onset of reflex augmentation: a premotor phase of constant reflex amplitude and a succeeding motor phase marked by progressively increasing reflex amplitude. Reflex augmentation during the motor phase was coupled more closely to the imminent movement than to the preceding signal to respond. The duration of the premotor phase was unaffected by RS predictability, but the duration of the motor phase (like RT) was shorter when the RS was more predictable. The maximum H reflex amplitude reached during the motor phase was greater when the RS was more predictable. The tonic level of H reflex amplitude during the premotor phase was greater in conditions that made prediction of the RS difficult. A second experiment showed that this difference was present throughout the foreperiod.

These results suggest that conditions that favor prediction of the RS enhance motor preparation. Changes in motor preparation (which affect RT) affect the processes underlying reflex augmentation in the motor phase. Enhanced preparation may allow more efficient organization of the descending commands to move, causing higher levels of spinal excitability to be reached in a briefer time. The higher tonic reflex amplitudes in the premotor phase and throughout the preceding foreperiod, in conditions that make prediction of the RS difficult, appear to reflect heightened general arousal.     

The Effect of Image Features on Judgments of Homophily,Credibility, and Intention to Use as Avatars in Future Interactions

Avatar characteristics influence the perception of the people they represent in a process that is remarkably similar to the way physical bodies influence person perception offline. This is consistent with the Social Responses to Computer Technologies model, which argues that people respond similarly to computers and people as long as sources are perceived to be intelligent. Similarly, Information Processing Theory suggests that the viewers apply the same evaluation sequences to nearly all sources and that more processing resources are allocated to perceiving an entity with social potential. To address the extent to which static avatars are perceived to be intelligent and human like, or have social potential, participants (N = 261) each evaluated a random set of 10 images as potential avatars. The avatars varied with respect to level of computer manipulation, visible indicators of masculinity, and anthropomorphism (having human characteristics). Results confirm that even static avatars are anthropomorphized and that visual characteristics influence perceptions of the avatars. Level of computer manipulation, masculinity, and anthropomorphism all influence perceived levels of realism, competence, and the sense of homophily with the avatar. The implications of these results for theory, future research, and for users and designers of communication systems are discussed.