Ordinal judgments of symbolic stimuli by capuchin monkeys (Cebus apella) and rhesus monkeys (Macaca mulatta): The effects of differential and nondifferential reward.

Ordinal learning was investigated in capuchin monkeys (Cebus apella) and rhesus monkeys (Macaca mulatta). In Experiment 1, both species were presented with pairings of the Arabic numerals 0 to 9. Some monkeys were given food rewards equal to the value of the numeral selected and some were rewarded with a single pellet only for choosing the higher numeral within the pair. Both species learned to select the larger numeral, but only rhesus monkeys that were differentially rewarded performed above chance levels when presented with novel probe pairings. In Experiment 2, the monkeys were first presented with arrays of 5 familiar numerals (from the range 0 to 9) and then arrays of 5 novel letters (from the range A to J) with the same reward outcomes in place as in Experiment 1. Both species performed better with the numerals, suggesting that an ordinal sequence of all stimuli had been learned during Experiment 1, rather than a matrix of two-choice discriminations. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Attention gating in short-term visual memory.

Investigated attention shift to a stream of numerals, in rapid serial visual presentation, using 3 graduate students with normal or corrected-to-normal vision. Ss detected a target embedded in a stream of letters presented at the left of fixation and, as quickly as possible, shifted their attention to a stream of numerals at the right of fixation. They attempted to report, in order, the 4 earliest occurring numerals after the target. Numerals appeared at rates of 4.6, 6.9, 9.2, and 13.4 sec. Analyses demonstrated that, for all Ss, targets, and numeral rates, the relative position of numerals in the response sequence showed clustering, disorder, and folding. Reported numerals tended to cluster around a stimulus position 400 msec after the target. Numerals were reported in an apparently haphazard order. The actual order of report resulted from a mixture of correctly ordered numerals with numerals ordered in the direction opposite to their order of presentation. Results are quantitatively described by a strength theory of order and are efficiently predicted by a computational attention gating model (AGM). The AGM may be derived from a more general attention model that assumes that (a) after detection of the target, an attention gate opens briefly to allow numerals to enter a visual short-term memory and (b) subsequent order of report depends on both item strength (how wide the gate was open during the numeral's entry) and on order information (item strength times cumulative strength of prior numerals). (78 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The mental representation of parity and number magnitude.

Nine experiments of timed odd–even judgments examined how parity and number magnitude are accessed from Arabic and verbal numerals. With Arabic numerals, Ss used the rightmost digit to access a store of semantic number knowledge. Verbal numerals went through an additional stage of transcoding to base 10. Magnitude information was automatically accessed from Arabic numerals. Large numbers preferentially elicited a rightward response, and small numbers a leftward response. The Spatial–Numerical Association of Response Codes effect depended only on relative number magnitude and was weaker or absent with letters or verbal numerals. Direction did not vary with handedness or hemispheric dominance but was linked to the direction of writing, as it faded or even reversed in right-to-left writing Iranian Ss. The results supported a modular architecture for number processing, with distinct but interconnected Arabic, verbal, and magnitude representations. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The reading problem in arithmetic.

Examined the methods used in the acquisition of the power of reading numerals. Graduate students read 2 kinds of materials: ordinary arithmetic problems and ordinary numerals placed in lines and isolated from each other. Ss were asked to make introspective observations of their procedures with the numerals. Two separate phases were distinguishable in the reading of the arithmetical problems: a 1st reading and a rereading. First readings involved either a detailed perception of a numeral (whole 1st reading) or a partial 1st reading, which appeared to be more efficient than whole 1st reading. Ss used direct computation without rereading even when the numerals had been read only partially during the 1st reading. Ss also divided the digits of numerals of any length into a certain number of groups made up of a certain number of digits. These groups stood in a certain order of succession. (0 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Processing of information in iconic memory: Differences between nonretarded and retarded subjects.

Compared iconic memory processes of 17 undergraduates and 18 retarded Ss (primarily aged 18–28 yrs; IQ 56–77) in 4 experiments. In Exp I, a partial report paradigm was used in which 6 retarded and 6 undergraduate Ss were presented 6 pictures under 4 intervals (0–500 msec). In Exp II, using 5 Ss in each group the same procedure as in Exp I was used but letters as well as pictures were included. Results show that although overall performance for retarded Ss was poor, they did better with letters than with pictures—a reverse of the finding with undergraduate Ss. In Exp III, 2 retarded Ss were given extended practice and incentive to perform well. Asymptote was reached in 10 days but never equaled performance of unpracticed undergraduates. In Exp IV, using 5 Ss in each group, information load was varied from 1 to 4 items, and a masking stimulus was used to interrupt processing following 6 intervals that lasted up to 250 msec. Results show that (1) there are quantitative differences between intelligence groups in iconic capacity; (2) retarded Ss process information more slowly, a difference that increases with increasing information load; and (3) there are substantive structural differences in iconic memory of retarded and nonretarded Ss. (35 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Categories of response to reunion with the parent at age 6: Predictable from infant attachment classifications and stable over a 1-month period.

Describes the development of a system for classifying attachment organization at age 6 on the basis of study of children's responses to unstructured reunions with parents. In a study of 33 families, 6th-year attachment classifications to mother were highly predictable from infancy attachment classifications to mother (84%), with Ss secure in infancy identified as secure on reunion at age 6 (Group B); and Ss insecure-avoidant in infancy identified as insecure-avoidant (Group A); Ss who were insecure-disorganized/disoriented identified as controlling of the parent (Group D). Lower predictability (61%) was found for attachment to father. An insecure-ambivalent (Group C) 6th-year classification was developed following the Berkeley study. In a 2nd study of child–mother dyads, (N?=?50), 62% of Ss were stable in (A, B, C, and D) classification across a 1-mo interval. When D children were reassigned to their best-fitting alternative A, B, or C categories, stability was high both for major classifications (A + B + C?=?86%) and for 7 subclassifications (A1, A2, B1/B2, B3, B4, C1, C2?=?76%). Avoidance of mother was stable across the 5-yr and the 1-mo periods. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

On detecting words embedded in a stream of auditory letters.

Presented 40 undergraduates with a stream of auditory letters in which some of the letters formed words. Ss were or were not given cues for the start of the words. It was found that (a) Ss required an indication of which letters started words. If certain letters formed part of more than 1 word, S detected the word for which a cue was provided but more often than not failed to detect the other word. When cues were provided on both words, the probability of getting both depended on the extent to which the 2 words "overlapped" in common letters. Results are discussed in the light of current work on serial processing. (French summary) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Presenting words without interior letters: Superiority over single letters and influence of postmask boundaries.

In 5 experiments with a total of 32 Ss, exterior letter pairs from 4-letter words (e.g., d??k from dark) were presented in pattern-postmasked displays, in the positions they would occupy if the whole word were shown. In Exp 1, letter pairs (d??k) were reported more accurately than single letters (d) (the pair–letter effect). In Exps 2 and 3, performances with letter pairs dropped to those for single letters when each letter in a pair was masked individually or when masks were much wider than letter pairs. In Exps 4 and 5, the pair–letter effect and mask influence were both removed when one letter in each pair was replaced by a number sign (d??#) or when letter pairs were not the exterior letters of real words (e.g., y??f). These findings suggest that the exterior letter combinations of words are represented psychologically and access to these representations is affected by mask configuration. Implications for current word-recognition models are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Double dissociation of functions in developmental dyslexia and dyscalculia.

This work examines the association between symbols and their representation in adult developmental dyscalculia and dyslexia. Experiment 1 used comparative judgment of numerals, and it was found that in physical comparisons (e.g., 3-5 vs. 3-5) the dyscalculia group showed a significantly smaller congruity effect than did the dyslexia and the control groups. Experiment 2 used Navon figures (D. Navon, 1977) in Hebrew, and participants were asked to name the large or the small letters. Phoneme similarity modulated performance of the control and the dyscalculia groups and showed a very small effect in the dyslexia group. This suggests that the dyscalculia population has difficulties in automatically associating numerals with magnitudes but no problems in associating letters with phonemes, whereas the dyslexia population shows the opposite pattern. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Suffix interference in the recall of linguistically coherent speech.

In Exp 1, definitions of low-frequency words were presented for on-line written recall. Each definition was followed by a nonword speech suffix presented in the same voice as the definition, the same nonword presented in a different voice, or a tone. There was a significant reduction in the recall of the terminal words of the definitions in the speech suffix conditions compared with the tone control. This pattern was replicated in Exp 2, in which Ss did not begin their recall until the suffix item or tone was presented, although the magnitude of the suffix effect was reduced in this experiment. In Exp 3, the suffix effect was considerably reduced compared with the suffix effect found with the definitions presented in Exps 1 and 2. This pattern was replicated in Exp 4, in which Ss did not begin their recall of the story sentences until the speech suffix or tone was presented. Results suggest that auditory memory interference can take place for linguistically coherent speech, although the magnitude of the interference decreases as one increases the level of linguistic structure in the to-be-recalled materials. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Processes underlying long-term repetition priming in digit data entry.

Two experiments examined long-term repetition priming in data entry. In each experiment, participants entered 4-digit numbers displayed as either words or numerals, and responded with digits (Experiment 1), or either digits or initial letters (Experiment 2). At test 1 week later, they entered old and new numbers, with the format changed for half of the old stimuli. Implicit memory was evidenced at test by faster entry of the old than the new numbers, regardless of whether the numbers were in the same or different format, suggesting that the abstract numerical meaning, not the surface form, contributes to repetition priming. Numbers presented as words in training had an advantage over numbers presented as numerals, regardless of response format, implying that type of processing also contributes to the effect and ruling out an explanation based on time spent processing numbers in word format. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

On the independence of naming and locating masked targets in visual search.

Twelve Ss were required to name or locate masked letters in arrays containing noise elements. Accuracy in locating was lower when target letters were presented among Vs than when presented among triangles or with no noise. Naming was as accurate when Vs and triangles were presented with the target as when no noise was presented. Since noise did not affect naming in the same way it affected locating, it was concluded that naming is independent of locating. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Expected locations of digits and letters on ten-button keysets.

In an attempt to find out where people expect to find letters and numbers on each of six configurations of ten keys, 300 Ss were asked to write on keyset diagrams either letters or numbers in arrangements they felt were most natural. Results showed that people expect (1) to find numbers arranged in left-to-right order in horizontal rows starting with the top, (2) to find letters, two or three on a key, in the same arrangement, and (3) to find letters arranged in horizontal rows when numbers already on the keyset are so arranged, but when the numbers are arranged otherwise (e.g., in vertical columns) the Ss divided about equally in arranging the numbers in horizontal rows and in vertical columns. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Type A behavior pattern and emotion expression in younger and older adults.

80 younger (M?=?28 yrs) and 80 older (>50 yrs, M?=?69 yrs) Type A and Type B Ss were evaluated for Type A behavior pattern using the Structured Interview (SI) and given personality tests for anxiety, depression, anger, aggression, hostility, and anger-in–anger-out. Ss also underwent an emotion induction procedure. Videotapes of the emotion induction procedure (N?=?160) and the SI (N?=?80) were coded for facial expression of emotion. Type As did not differ from Bs on anxiety or depression but did on anger and aggression. Type As showed anger inhibition and anger bound to shame, as predicted by emotion socialization theory. The greatest number of differential effects were observed between age groups. Older individuals, in general, were more emotionally expressive than younger Ss across a range of emotions. Women appeared more conflicted about anger expression than men, and Type A women more so than Type A men. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Visual hemifield differences in the perception of letters and contour orientation.

In Exp. I, 10 students were required to recognize capital English letters presented 3– to the left or to the right of a fixation point. In Exp. II, 8 Ss were required to discriminate the orientation of a line presented in either the left or the right visual hemifield. In both experiments Ss displayed a significant right visual hemifield superiority, and a marked positive correlation was observed in the hemifield differences between the 2 recognition tasks. Results suggest that for certain classes of stimuli visual laterality differences may be subserved by a selective contour-tuning mechanism. (French summary) (15 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Identification of words and letters during reading: A sentence inferiority effect for letter detection.

Examined the behavior of searching rapid serial visual presentations (RSVP) of normal sentences that involves identification of words as units and the focus on word meaning and syntax. As a result of RSVP, individual letters are difficult to identify. In 2 experiments Ss searched for targets in RSVP displays of normal sentences and of scrambled sentences. Ss more accurately detected word targets when searching normal as compared with scrambled sentences. The opposite result, a sentence inferiority effect, was obtained when Ss searched for single-letter targets. It is concluded that the predisposition to attend to higher level information in sentences interferes with the ability to detect individual letters. (French abstract) (19 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The stimulus suffix effect and positional uncertainty.

Conducted 2 serial recall experiments with 68 undergraduates to determine if a stimulus suffix creates positional uncertainty that contributes to the suffix effect. In Exp 1, Ss recalled all or some of 8 auditorily presented letters. During recall, nontested letters were shown in position to reduce uncertainty about position. In Exp 2, nontested letters were not shown during recall. Despite differences between the 2 experiments, the serial position functions were almost identical. It is concluded that positional uncertainty is a component of the terminal suffix effect but not of preterminal suffix effects. (French abstract) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Est-ce que l'identification d'un stimulus visuel se produit en l'absence de traitement attentif?

Studied the identification of distractors located within a compound visual stimulus to test the conclusion of 2 previous studies (L. Paquet and K. Appleby, 1988; Paquet and P. M. Merikle, 1988) that stimuli to which an S is inattentive receive a partial perceptual analysis that does not include identification. Ss were 24 university students. In 2 experiments, 2 compound stimuli (2 large letters consisting of smaller letters) were presented side by side and attention was directed to 1 of the 2 stimuli (relevant object). The Stroop effect produced by various aspects of the irrelevant compound stimulus was measured. (English abstract) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Saccadic system functioning among schizophrenia patients and their first-degree biological relatives.

In Study 1, 30 schizophrenia Ss and 27 nonpsychiatric comparison Ss were presented with a fixation task, a visually guided reflexive saccade (prosaccade) task, a predictive tracking task (0.4-Hz square wave), and an antisaccade task. The 2 groups did not differ on either the fixation or prosaccade tasks. Schizophrenia Ss had an increased number of errors on the antisaccade task and had decreased rightward visually guided saccade amplitudes during the predictive tracking task. In Study 2, 13 psychiatric comparison Ss and 32 1st-degree biological relatives of the schizophrenia Ss were compared with the schizophrenia Ss and a larger and older sample of nonpsychiatric Ss (n?=?33) on the predictive tracking and antisaccade tasks. The groups did not differ on predictive saccadic tracking. The schizophrenia Ss and their 1st-degree biological relatives made more errors on the antisaccade task than both the nonpsychiatric and psychiatric comparison groups (who did not significantly differ). Results are consistent with the notion that dysfunction of dorsolateral prefrontal cortex, caudate nucleus, or both is related to liability for schizophrenia. (PsycINFO Database Record (c) 2010 APA, all rights reserved)