Timed picture naming: Extended norms and validation against previous studies

Factors affecting word retrieval were compared in a timed picture-naming paradigm for 520 drawings of objects. In prior timed and untimed studies by Snodgrass and Vanderwart (1980) and Snodgrass and Yuditsky (1996), concerns were raised that participants could not reliably name large numbers of items in a single session. We show that reliable results are obtained in a single session for 520 items and validate our method against previous findings by Snodgrass and colleagues for overlapping items. For these items, comparable levels of name agreement and latency are obtained, and we replicate effects of length, frequency, both objective and subjective age of acquisition, and visual complexity on reaction time (RT) and name agreement measures. Name agreement is unaffected by order of presentation, although there is a gradual increase in RTs across the session, requiring use of multiple random orders. Current extensions of our method include cross-linguistic, bilingual, developmental, and neuropsychological studies and comparisons of action naming and object naming.     

Development of cognitive averaging: when light and light make dark

In two experiments we studied developmental changes in reasoning about intensive quantities. In contrast to previous studies, color--an intensive quantity that is readily perceivable--was chosen as stimulus material. Children between 6 and 12 years of age and adults predicted the mixture intensity of pairs of liquids with different intensities of red color, the liquid volumes in the two source glasses either being the same (Experiment 1) or different (Experiment 2). The data show that cognitive averaging in this domain develops late and slowly. An extensitivity bias, a strong tendency to use rules (adding in particular) that hold for extensive but not for intensive quantities, predominated up to the age of 12 years and was not totally absent in adults. Contrary to common expectation, children's use of the correct averaging rule became more likely when an extensive quantity, volume, was also varied and thus the task increased in complexity.     

A search for parenting style: a cross-situational analysis of parental behavior

Cross-situational stability in parents' emotional warmth and guidance was studied by observing parents (N = 77, M age = 38 years) with their school-aged child in 2 dyadic problem-solving situations and in a family discussion concerning a moral dilemma. The observational data were coded by independent observers using dimensional ratings and dichotomous frequency counts as the 2 coding procedures. These procedures yielded a similar pattern of findings. Parents tended to behave consistently across situations, although the type of situation did affect the amount of emotional warmth and guidance manifested by the parent. Stability was further analyzed by means of structural equation modeling to test whether variance in parents' emotional warmth and guidance across situations was attributable to a generalized parenting style factor. A Parenting Style factor was identified that reflected the parents' child-centeredness; this factor explained, in part, parental behavior within each situation, although contextual factors also contributed to situation-specific variations from task to task.     

On weighted exponential entropies

As an alternative to Shannon's classical entropy measure of information, an exponential entropy function was proposed by Pal and Pal in 1989 and 1991. To generalize Pal's entropy further, this author introduced two different families of exponential entropies that are one-parameter generalizations of Pal's entropy. The purpose of the present paper is to define weighted entropies corresponding to those one-parameter generalizations. Some properties and examples of such weighted exponential entropies are discussed.     

Methodology in subliminal psychodynamic activation: the next step in the debate

Subliminal psychdynamic activation methodology has recently been the subject of an exchange of views between Birgeg?rd and Sohlberg (1999) and Fudin (2000). The agreements and some remaining points of contention are summarized here. The main difference of opinion appears to concern unconscious verbal encoding in relation to subjective experience in subliminal stimulation and whether subliminal psychodynamic activation results are unreliable until a full explanation of how verbal encoding works is at hand. We conclude that clarifying perspectives is important and that those suggesting alternative explanations of results on subliminal psychodynamic activation must now empirically investigate their claims.     

Using temporal information to construct, update, and retrieve situation models of narratives

Four experiments explored how readers use temporal information to construct and update situation models and retrieve them from memory. In Experiment 1, readers spontaneously constructed temporal and spatial situation models of single sentences. In Experiment 2, temporal inconsistencies caused problems in updating situation models similar to those observed previously for other dimensions of situation models. In Experiment 3, merely implied temporal order information was inferred from narratives, affecting comprehension of later sentences like explicitly stated order information. Moreover, inconsistent temporal order information prevented the creation and storage in memory of an integrated situation model. In Experiment 4, a temporal inconsistency increased processing time even if readers were unable to report the inconsistency. These results confirm the significance of the temporal dimension of situation models.     

Social inhibition and overfriendliness: two-year follow-up and observational validation

Studied socioemotional functioning in 3 groups (n = 15) of high-inhibited, low-inhibited-overfriendly, and low-inhibited-low-overfriendly children at age 9, who were identified by parental ratings in a sample (N = 392) at age 7. Ratings of social inhibition and overfriendliness were stable over the 2-year period from age 7 to age 9. Validity of rated social inhibition and overfriendliness is established with behavioral observations, both predictively and concurrently. The groups are contrasted along the dimensions of social inhibition and overfriendliness with respect to socioemotional distress, social problem solving, empathic ability, and the disinhibitory phenomena of thrill seeking and hyperactivity. The high-inhibited group shows heightened socioemotional distress. The overfriendly group shows heightened levels of thrill seeking and hyperactivity. Social problem solving and empathy are less well developed in the inhibited and in the overfriendly group as contrasted to the low-inhibited-low-overfriendly group. The results are interpreted in terms of risks for socioemotional problems at both ends of the dimension of social inhibition.     

Walking or talking? Behavioral and neurophysiological correlates of action verb processing

Brain activity elicited by visually presented words was investigated using behavioral measures and current source densities calculated from high-resolution EEG recordings. Verbs referring to actions usually performed with different body parts were compared. Behavioral data indicated faster processing of verbs referring to actions performed with the face muscles and articulators (face-related words) compared to verbs referring to movements involving the lower half of the body (leg-related words). Significant topographical differences in brain activity elicited by verb types were found starting approximately 250 ms after word onset. Differences were seen at recording sites located over the motor strip and adjacent frontal cortex. At the vertex, close to the cortical representation of the leg, leg-related verbs (for example, to walk) produced strongest in-going currents, whereas for face-related verbs (for example, to talk) the most in-going activity was seen at more lateral electrodes placed over the left Sylvian fissure, close to the representation of the articulators. Thus, action words caused differential activation along the motor strip, with strongest in-going activity occurring close to the cortical representation of the body parts primarily used for carrying out the actions the verbs refer to. Topographically specific physiological signs of word processing started earlier for face-related words and lasted longer for verbs referring to leg movements. We conclude that verb types can differ in their processing speed and can elicit neurophysiological activity with different cortical topographies. These behavioral and physiological differences can be related to cognitive processes, in particular to lexical semantic access. Our results are consistent with associative theories postulating that words are organized in the brain as distributed cell assemblies whose cortical distributions reflect the words' meanings.     

Further Support for a Hierarchical Model of Affect: Reply to Green and Salovey

Green and Salovey agree with us that happiness and sadness are strongly bipolar, and that Positive and Negative Activation are not. However, Green and Salovey subscribe to the two-dimensional circumplex, a model we find wanting. Actually, the problems they discuss arise from the limitations of the circumplex rather than from issues fundamental to affective structure. And they do not consider the evidence, reported in our target article, that supports an alternative to the circumplex: a three-level hierarchical model. In this reply, we take a closer look at the empirical findings supporting this model, and we emphasize its heuristic promise.     

Visual perception in 'low vision'

'Low vision' has an international classification as an impairment of vision that is defined by loss of visual acuity and the size of the visual field. Functional classification that would depict capability to use vision in different activities has not yet been agreed upon. Abnormal visual information leads to changes in visual perception, and brain-damage-related visual impairment may alter or prevent one or several cognitive visual functions. Abnormal visual perception opens a window into brain mechanisms that the psychophysicists otherwise do not have. Together with clinicians, psychophysicists can help visually impaired persons to understand the nature of their disability by thoroughly studying the nature of the altered image and the profile of cognitive visual functions.