The effect of subliminal stimulation upon autonomic and verbal behavior.

Using the subception hypothesis of Lazarus and McCleary, 2 hypotheses pertaining to the effect upon verbal and autonomic behavior of subliminal visual stimulation were tested. The hypotheses stated that: response latencies and GSRs would be determined by the affective value of the stimuli, and the verbal guesses made during subliminal stimulation would be associations to the stimulus items. 7 Ss were used, and after subliminal presentation of the stimuli, each S was presented with his responses and asked to match them against the stimulus items. The part of the hypothesis pertaining to response latencies was not supported, but the part pertaining to GSRs was confirmed. The second hypothesis, likewise, was confirmed. 18 references. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A clinical-experimental approach to the study of subliminal stimulation: The effects of a drive-related stimulus upon Rorschach responses.

This was an investigation of the effects of a drive-related subliminal stimulus on subsequent Rorschach images. 60 male Ss were seen for an experimental and control session in a balanced design. Ss were divided into 5 groups on the basis of their recogniton thresholds for the drive-related stimulus and a neutral stimulus. For each group, different predictions were made as to how the subliminally presented drive stimulus would affect subsequent Rorschach performance. The results indicated: for the total group, there was a clearcut subliminal effect; the nature of this effect varied considerably among Ss with regard to the relative influence of drive-expressive and defensive reactions; the different ways Ss responded to the subliminal activation were systematically related to their threshold behavior. (23 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Explicit mechanisms do not account for implicit localization and identification of change: An empirical reply to Mitroff et al. (2002).

Several recent findings support the notion that changes in the environment can be implicitly represented by the visual system. S. R. Mitroff, D. J. Simons, and S. L. Franconeri (see record 2002-15293-003) challenged this view and proposed alternative interpretations based on explicit strategies. Across 4 experiments, the current study finds no empirical support for such alternative proposals. Experiment 1 shows that subjects do not rely on unchanged items when locating an unaware change. Experiments 2 and 3 show that unaware changes affect performance even when they occur at an unpredictable location. Experiment 4 shows that the unaware congruency effect does not depend simply on the pattern of the final display. The authors point to converging evidence from other methodologies and highlight several weaknesses in Mitroff et al's theoretical arguments. It is concluded here that implicit representation of change provides the most parsimonious explanation for both past and present findings. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Lengthing the duration of response execution does not modulate blindness to action-compatible stimuli.

Action-compatible blindness refers to the finding that target stimuli are perceived less frequently if they are presented during the planning or execution of a compatible action (e.g., a left arrow presented during a left manual key press) than during an incompatible action (J. Müsseler and B. Hommel, 1997 a, b). We investigated the effect of lengthening the response execution phase in the action-compatible blindness paradigm by requiring subjects to tap a response key once or three times on the assumption that tapping three times would increase the duration of the execution phase of the response. Prior research (e.g., B. Stevanovski et al (2002); P. Wühr and J. Müsseler, [2001]) has shown that larger blindness effects are observed for targets presented during the execution phase of a response than after the response has been made. We investigated whether a larger blindness effect would be observed in the three-tap condition than in the one-tap condition, or whether lengthening the duration of the response would extend the time course of the blindness effect. Neither of these possibilities was supported by the data irrespective of whether the number of taps to be made was blocked or mixed within a block of trials. The results are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The effect of distinctive parts on recognition of depth-rotated objects by pigeons (Columba livia) and humans.

To explore whether effects observed in human object recognition represent fundamental properties of visual perception that are general across species, the authors trained pigeons (Columba livia) and humans to discriminate between pictures of 3-dimensional objects that differed in shape. Novel pictures of the depth-rotated objects were then tested for recognition. Across conditions, the object pairs contained either 0, 1, 3, or 5 distinctive pails. Pigeons showed viewpoint dependence in all object-part conditions, and their performance declined systematically with degree of rotation from the nearest training view. Humans showed viewpoint invariance for novel rotations between the training views but viewpoint dependence for novel rotations outside the training views. For humans, but not pigeons, viewpoint dependence was weakest in the 1-part condition. The authors discuss the results in terms of structural and multiple-view models of object recognition. (PsycINFO Database Record (c) 2010 APA, all rights reserved)